diff --git a/common/chrome.manifest b/common/chrome.manifest
index b55978f4..3eae8e1c 100644
--- a/common/chrome.manifest
+++ b/common/chrome.manifest
@@ -1,7 +1,9 @@
+resource dactyl-local         ./
 resource dactyl-local-content content/
 resource dactyl-local-skin    skin/
 resource dactyl-local-locale  locale/
 
+resource dactyl-common      ../common/
 resource dactyl             ../common/modules/
 resource dactyl-content     ../common/content/
 resource dactyl-skin        ../common/skin/
diff --git a/common/config.json b/common/config.json
new file mode 100644
index 00000000..f9aee18a
--- /dev/null
+++ b/common/config.json
@@ -0,0 +1,38 @@
+{
+    "completers": {
+        "abbreviation": "abbreviation",
+        "altstyle": "alternateStyleSheet",
+        "bookmark": "bookmark",
+        "buffer": "buffer",
+        "charset": "charset",
+        "color": "colorScheme",
+        "command": "command",
+        "dialog": "dialog",
+        "dir": "directory",
+        "environment": "environment",
+        "event": "autocmdEvent",
+        "extension": "extension",
+        "file": "file",
+        "help": "help",
+        "highlight": "highlightGroup",
+        "history": "history",
+        "javascript": "javascript",
+        "macro": "macro",
+        "mapping": "userMapping",
+        "mark": "mark",
+        "menu": "menuItem",
+        "option": "option",
+        "preference": "preference",
+        "qmark": "quickmark",
+        "runtime": "runtime",
+        "search": "search",
+        "shellcmd": "shellCommand",
+        "toolbar": "toolbar",
+        "url": "url",
+        "usercommand": "userCommand"
+    },
+
+    "option-defaults": {
+        "guioptions": "rb"
+    }
+}
diff --git a/common/content/commandline.js b/common/content/commandline.js
index 0a556dbd..61d9fbd5 100644
--- a/common/content/commandline.js
+++ b/common/content/commandline.js
@@ -20,7 +20,7 @@ var CommandWidgets = Class("CommandWidgets", {
                 eventTarget: commandline
             },
             append: <e4x xmlns={XUL} xmlns:dactyl={NS}>
-                <vbox id={config.commandContainer}>
+                <vbox id={config.ids.commandContainer}>
                     <vbox class="dactyl-container" hidden="false" collapsed="true">
                         <iframe class="dactyl-completions" id="dactyl-completions-dactyl-commandline" src="dactyl://content/buffer.xhtml"
                                 contextmenu="dactyl-contextmenu"
diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 967c740d..f368786d 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -1377,7 +1377,7 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
 
         options.add(["guioptions", "go"],
             "Show or hide certain GUI elements like the menu or toolbar",
-            "charlist", config.defaults.guioptions || "", {
+            "charlist", "", {
 
                 // FIXME: cleanup
                 cleanupValue: config.cleanups.guioptions ||
@@ -1406,7 +1406,7 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
 
         options.add(["titlestring"],
             "The string shown at the end of the window title",
-            "string", config.defaults.titlestring || config.host,
+            "string", config.host,
             {
                 setter: function (value) {
                     let win = document.documentElement;
diff --git a/common/content/mow.js b/common/content/mow.js
index 80359e65..90c3001d 100644
--- a/common/content/mow.js
+++ b/common/content/mow.js
@@ -67,7 +67,7 @@ var MOW = Module("mow", {
                         </menupopup>
                     </popupset>
                 </window>
-                <vbox id={config.commandContainer}>
+                <vbox id={config.ids.commandContainer}>
                     <vbox class="dactyl-container" id="dactyl-multiline-output-container" hidden="false" collapsed="true">
                         <iframe id="dactyl-multiline-output" src="dactyl://content/buffer.xhtml"
                                 flex="1" hidden="false" collapsed="false" contextmenu="dactyl-contextmenu"
diff --git a/common/content/tabs.js b/common/content/tabs.js
index 7ba354ba..aa3a7bd3 100644
--- a/common/content/tabs.js
+++ b/common/content/tabs.js
@@ -23,7 +23,7 @@ var Tabs = Module("tabs", {
 
         // hide tabs initially to prevent flickering when 'stal' would hide them
         // on startup
-        if (config.hasTabbrowser)
+        if (config.has("tabbrowser"))
             config.tabStrip.collapsed = true;
 
         this.tabStyle = styles.system.add("tab-strip-hiding", config.styleableChrome,
@@ -762,7 +762,7 @@ var Tabs = Module("tabs", {
             function () { tabs.select(0, false); },
             { argCount: "0" });
 
-        if (config.hasTabbrowser) {
+        if (config.has("tabbrowser")) {
             commands.add(["b[uffer]"],
                 "Switch to a buffer",
                 function (args) { tabs.switchTo(args[0], args.bang, args.count); }, {
@@ -1014,7 +1014,7 @@ var Tabs = Module("tabs", {
             function ({ count }) { tabs.select("-" + (count || 1), true); },
             { count: true });
 
-        if (config.hasTabbrowser) {
+        if (config.has("tabbrowser")) {
             mappings.add([modes.NORMAL], ["b"],
                 "Open a prompt to switch buffers",
                 function ({ count }) {
@@ -1071,7 +1071,7 @@ var Tabs = Module("tabs", {
     options: function () {
         options.add(["showtabline", "stal"],
             "Define when the tab bar is visible",
-            "string", config.defaults["showtabline"],
+            "string", true,
             {
                 setter: function (value) {
                     if (value === "never")
@@ -1099,7 +1099,7 @@ var Tabs = Module("tabs", {
                 }
             });
 
-        if (config.hasTabbrowser) {
+        if (config.has("tabbrowser")) {
             let activateGroups = [
                 ["all", "Activate everything"],
                 ["addons", ":addo[ns] command"],
diff --git a/common/modules/base.jsm b/common/modules/base.jsm
index f54266e1..904491f5 100644
--- a/common/modules/base.jsm
+++ b/common/modules/base.jsm
@@ -915,6 +915,7 @@ Class.Update = function Update(obj)
     Class.Property({
         configurable: true,
         enumerable: true,
+        writable: true,
         init: function (key, target) {
             this.value = update({}, target[key], obj);
         }
diff --git a/common/modules/completion.jsm b/common/modules/completion.jsm
index 4c06fb00..ba9299c7 100644
--- a/common/modules/completion.jsm
+++ b/common/modules/completion.jsm
@@ -1133,7 +1133,7 @@ var Completion = Module("completion", {
 
         options.add(["complete", "cpt"],
             "Items which are completed at the :open prompts",
-            "stringlist", config.defaults.complete == null ? "slf" : config.defaults.complete,
+            "stringlist", "slf",
             {
                 valueMap: {
                     S: "suggestion",
diff --git a/common/modules/config.jsm b/common/modules/config.jsm
index 33ac268b..c13f910f 100644
--- a/common/modules/config.jsm
+++ b/common/modules/config.jsm
@@ -36,13 +36,14 @@ AboutHandler.prototype = {
 
     getURIFlags: function (uri) Ci.nsIAboutModule.ALLOW_SCRIPT,
 };
-
 var ConfigBase = Class("ConfigBase", {
     /**
      * Called on dactyl startup to allow for any arbitrary application-specific
      * initialization code. Must call superclass's init function.
      */
     init: function init() {
+        this.loadConfig();
+
         this.features.push = deprecated("Set.add", function push(feature) Set.add(this, feature));
         if (this.haveGecko("2b"))
             Set.add(this.features, "Gecko2");
@@ -62,6 +63,40 @@ var ConfigBase = Class("ConfigBase", {
         });
     },
 
+    get has() Set.has(this.features),
+
+    configFiles: [
+        "resource://dactyl-common/config.json",
+        "resource://dactyl-local/config.json"
+    ],
+
+    configs: Class.Memoize(function () this.configFiles.map(function (url) JSON.parse(File.readURL(url)))),
+
+    loadConfig: function loadConfig(documentURL) {
+
+        for each (let config in this.configs) {
+            if (documentURL)
+                config = config.overlays && config.overlays[documentURL] || {};
+
+            for (let [name, value] in Iterator(config)) {
+                let prop = util.camelCase(name);
+
+                if (isArray(this[prop]))
+                    this[prop] = [].concat(this[prop], value);
+                else if (isObject(this[prop])) {
+                    if (isArray(value))
+                        value = Set(value);
+
+                    this[prop] = update({}, this[prop],
+                                        iter([util.camelCase(k), value[k]]
+                                             for (k in value)).toObject());
+                }
+                else
+                    this[prop] = value;
+            }
+        }
+    },
+
     modules: {
         global: ["addons",
                  "base",
@@ -149,6 +184,8 @@ var ConfigBase = Class("ConfigBase", {
                     AddonManager.getAddonByID(this.addonID);
     }),
 
+    get styleableChrome() Object.keys(this.overlays),
+
     /**
      * The current application locale.
      */
@@ -398,8 +435,9 @@ var ConfigBase = Class("ConfigBase", {
         this.helpCSS = true;
     },
 
-    Local: function Local(dactyl, modules, window) ({
+    Local: function Local(dactyl, modules, { document, window }) ({
         init: function init() {
+            this.loadConfig(document.documentURI);
 
             let append = <e4x xmlns={XUL} xmlns:dactyl={NS}>
                     <menupopup id="viewSidebarMenu"/>
@@ -418,6 +456,14 @@ var ConfigBase = Class("ConfigBase", {
             util.overlayWindow(window, { append: append.elements() });
         },
 
+        get window() window,
+
+        get document() document,
+
+        ids: Class.Update({
+            get commandContainer() document.documentElement.id
+        }),
+
         browser: Class.Memoize(function () window.gBrowser),
         tabbrowser: Class.Memoize(function () window.gBrowser),
 
@@ -426,7 +472,7 @@ var ConfigBase = Class("ConfigBase", {
         /**
          * @property {string} The ID of the application's main XUL window.
          */
-        mainWindowId: window.document.documentElement.id,
+        mainWindowId: document.documentElement.id,
 
         /**
          * @property {number} The height (px) that is available to the output
@@ -434,7 +480,7 @@ var ConfigBase = Class("ConfigBase", {
          */
         get outputHeight() this.browser.mPanelContainer.boxObject.height,
 
-        tabStrip: Class.Memoize(function () window.document.getElementById("TabsToolbar") || this.tabbrowser.mTabContainer),
+        tabStrip: Class.Memoize(function () document.getElementById("TabsToolbar") || this.tabbrowser.mTabContainer),
     }),
 
     /**
@@ -448,45 +494,15 @@ var ConfigBase = Class("ConfigBase", {
      * @property {Object} A map of :command-complete option values to completer
      *     function names.
      */
-    completers: {
-       abbreviation: "abbreviation",
-       altstyle: "alternateStyleSheet",
-       bookmark: "bookmark",
-       buffer: "buffer",
-       charset: "charset",
-       color: "colorScheme",
-       command: "command",
-       dialog: "dialog",
-       dir: "directory",
-       environment: "environment",
-       event: "autocmdEvent",
-       extension: "extension",
-       file: "file",
-       help: "help",
-       highlight: "highlightGroup",
-       history: "history",
-       javascript: "javascript",
-       macro: "macro",
-       mapping: "userMapping",
-       mark: "mark",
-       menu: "menuItem",
-       option: "option",
-       preference: "preference",
-       qmark: "quickmark",
-       runtime: "runtime",
-       search: "search",
-       shellcmd: "shellCommand",
-       toolbar: "toolbar",
-       url: "url",
-       usercommand: "userCommand"
-    },
+    completers: {},
 
     /**
      * @property {Object} Application specific defaults for option values. The
      *     property names must be the options' canonical names, and the values
      *     must be strings as entered via :set.
      */
-    defaults: { guioptions: "rb" },
+    optionDefaults: {},
+
     cleanups: {},
 
     /**
@@ -517,8 +533,6 @@ var ConfigBase = Class("ConfigBase", {
 
     guioptions: {},
 
-    hasTabbrowser: false,
-
     /**
      * @property {string} The name of the application that hosts the
      *     extension. E.g., "Firefox" or "XULRunner".
@@ -551,525 +565,11 @@ var ConfigBase = Class("ConfigBase", {
      * @property {string} The default highlighting rules.
      * See {@link Highlights#loadCSS} for details.
      */
-    CSS: UTF8(String.replace(<><![CDATA[
-        // <css>
-        Boolean      /* JavaScript booleans */       color: red;
-        Function     /* JavaScript functions */      color: navy;
-        Null         /* JavaScript null values */    color: blue;
-        Number       /* JavaScript numbers */        color: blue;
-        Object       /* JavaScript objects */        color: maroon;
-        String       /* String values */             color: green; white-space: pre;
-        Comment      /* JavaScriptor CSS comments */ color: gray;
+    CSS: Class.Memoize(function () File.readURL("resource://dactyl-skin/global-styles.css")),
 
-        Key          /* Keywords */                  font-weight: bold;
-
-        Enabled      /* Enabled item indicator text */  color: blue;
-        Disabled     /* Disabled item indicator text */ color: red;
-
-        FontFixed           /* The font used for fixed-width text */ \
-                                             font-family: monospace !important;
-        FontCode            /* The font used for code listings */ \
-                            font-size: 9pt;  font-family: monospace !important;
-        FontProportional    /* The font used for proportionally spaced text */ \
-                            font-size: 10pt; font-family: "Droid Sans", "Helvetica LT Std", Helvetica, "DejaVu Sans", Verdana, sans-serif !important;
-
-        // Hack to give these groups slightly higher precedence
-        // than their unadorned variants.
-        CmdCmdLine;[dactyl|highlight]>*  &#x0d; StatusCmdLine;[dactyl|highlight]>*
-        CmdNormal;[dactyl|highlight]     &#x0d; StatusNormal;[dactyl|highlight]
-        CmdErrorMsg;[dactyl|highlight]   &#x0d; StatusErrorMsg;[dactyl|highlight]
-        CmdInfoMsg;[dactyl|highlight]    &#x0d; StatusInfoMsg;[dactyl|highlight]
-        CmdModeMsg;[dactyl|highlight]    &#x0d; StatusModeMsg;[dactyl|highlight]
-        CmdMoreMsg;[dactyl|highlight]    &#x0d; StatusMoreMsg;[dactyl|highlight]
-        CmdQuestion;[dactyl|highlight]   &#x0d; StatusQuestion;[dactyl|highlight]
-        CmdWarningMsg;[dactyl|highlight] &#x0d; StatusWarningMsg;[dactyl|highlight]
-
-        Normal            /* Normal text */ \
-                          color: black   !important; background: white       !important; font-weight: normal !important;
-        StatusNormal      /* Normal text in the status line */ \
-                          color: inherit !important; background: transparent !important;
-        ErrorMsg          /* Error messages */ \
-                          color: white   !important; background: red         !important; font-weight: bold !important;
-        InfoMsg           /* Information messages */ \
-                          color: black   !important; background: white       !important;
-        StatusInfoMsg     /* Information messages in the status line */ \
-                          color: inherit !important; background: transparent !important;
-        LineNr            /* The line number of an error */ \
-                          color: orange  !important; background: white       !important;
-        ModeMsg           /* The mode indicator */ \
-                          color: black   !important; background: white       !important;
-        StatusModeMsg     /* The mode indicator in the status line */ \
-                          color: inherit !important; background: transparent !important; padding-right: 1em;
-        MoreMsg           /* The indicator that there is more text to view */ \
-                          color: green   !important; background: white       !important;
-        StatusMoreMsg                                background: transparent !important;
-        Message           /* A message as displayed in <ex>:messages</ex> */ \
-                          white-space: pre-wrap !important; min-width: 100%; width: 100%; padding-left: 4em; text-indent: -4em; display: block;
-        Message String    /* A message as displayed in <ex>:messages</ex> */ \
-                          white-space: pre-wrap;
-        NonText           /* The <em>~</em> indicators which mark blank lines in the completion list */ \
-                          color: blue; background: transparent !important;
-        *Preview          /* The completion preview displayed in the &tag.command-line; */ \
-                          color: gray;
-        Question          /* A prompt for a decision */ \
-                          color: green   !important; background: white       !important; font-weight: bold !important;
-        StatusQuestion    /* A prompt for a decision in the status line */ \
-                          color: green   !important; background: transparent !important;
-        WarningMsg        /* A warning message */ \
-                          color: red     !important; background: white       !important;
-        StatusWarningMsg  /* A warning message in the status line */ \
-                          color: red     !important; background: transparent !important;
-        Disabled          /* Disabled items */ \
-                          color: gray    !important;
-
-        CmdLine;>*;;FontFixed   /* The command line */ \
-                                padding: 1px !important;
-        CmdPrompt;.dactyl-commandline-prompt  /* The default styling form the command prompt */
-        CmdInput;.dactyl-commandline-command
-        CmdOutput         /* The output of commands executed by <ex>:run</ex> */ \
-                          white-space: pre;
-
-        CompGroup                      /* Item group in completion output */
-        CompGroup:not(:first-of-type)  margin-top: .5em;
-        CompGroup:last-of-type         padding-bottom: 1.5ex;
-
-        CompTitle            /* Completion row titles */ \
-                             color: magenta; background: white; font-weight: bold;
-        CompTitle>*          padding: 0 .5ex;
-        CompTitleSep         /* The element which separates the completion title from its results */ \
-                             height: 1px; background: magenta; background: -moz-linear-gradient(60deg, magenta, white);
-
-        CompMsg              /* The message which may appear at the top of a group of completion results */ \
-                             font-style: italic; margin-left: 16px;
-
-        CompItem             /* A single row of output in the completion list */
-        CompItem:nth-child(2n+1)    background: rgba(0, 0, 0, .04);
-        CompItem[selected]   /* A selected row of completion list */ \
-                             background: yellow;
-        CompItem>*           padding: 0 .5ex;
-
-        CompIcon             /* The favicon of a completion row */ \
-                             width: 16px; min-width: 16px; display: inline-block; margin-right: .5ex;
-        CompIcon>img         max-width: 16px; max-height: 16px; vertical-align: middle;
-
-        CompResult           /* The result column of the completion list */ \
-                             width: 36%; padding-right: 1%; overflow: hidden;
-        CompDesc             /* The description column of the completion list */ \
-                             color: gray; width: 62%; padding-left: 1em;
-
-        CompLess             /* The indicator shown when completions may be scrolled up */ \
-                             text-align: center; height: 0;    line-height: .5ex; padding-top: 1ex;
-        CompLess::after      /* The character of indicator shown when completions may be scrolled up */ \
-                             content: "⌃";
-
-        CompMore             /* The indicator shown when completions may be scrolled down */ \
-                             text-align: center; height: .5ex; line-height: .5ex; margin-bottom: -.5ex;
-        CompMore::after      /* The character of indicator shown when completions may be scrolled down */ \
-                             content: "⌄";
-
-        Dense              /* Arbitrary elements which should be packed densely together */\
-                           margin-top: 0; margin-bottom: 0;
-
-        EditorEditing;;*   /* Text fields for which an external editor is open */ \
-                           background-color: #bbb !important; -moz-user-input: none !important; -moz-user-modify: read-only !important;
-        EditorError;;*     /* Text fields briefly after an error has occurred running the external editor */ \
-                           background: red !important;
-        EditorBlink1;;*    /* Text fields briefly after successfully running the external editor, alternated with EditorBlink2 */ \
-                           background: yellow !important;
-        EditorBlink2;;*    /* Text fields briefly after successfully running the external editor, alternated with EditorBlink1 */
-
-        REPL                /* Read-Eval-Print-Loop output */ \
-                            overflow: auto; max-height: 40em;
-        REPL-R;;;Question   /* Prompts in REPL mode */
-        REPL-E              /* Evaled input in REPL mode */ \
-                            white-space: pre-wrap;
-        REPL-P              /* Evaled output in REPL mode */ \
-                            white-space: pre-wrap; margin-bottom: 1em;
-
-        Usage               /* Output from the :*usage commands */ \
-                            width: 100%;
-        UsageHead           /* Headings in output from the :*usage commands */
-        UsageBody           /* The body of listings in output from the :*usage commands */
-        UsageItem           /* Individual items in output from the :*usage commands */
-        UsageItem:nth-of-type(2n)    background: rgba(0, 0, 0, .04);
-
-        Indicator   /* The <em>#</em> and  <em>%</em> in the <ex>:buffers</ex> list */ \
-                    color: blue; width: 1.5em; text-align: center;
-        Filter      /* The matching text in a completion list */ \
-                    font-weight: bold;
-
-        Keyword     /* A bookmark keyword for a URL */ \
-                    color: red;
-        Tag         /* A bookmark tag for a URL */ \
-                    color: blue;
-
-        Link                        /* A link with additional information shown on hover */ \
-                                    position: relative; padding-right: 2em;
-        Link:not(:hover)>LinkInfo   opacity: 0; left: 0; width: 1px; height: 1px; overflow: hidden;
-        LinkInfo                    {
-            /* Information shown when hovering over a link */
-            color: black;
-            position: absolute;
-            left: 100%;
-            padding: 1ex;
-            margin: -1ex -1em;
-            background: rgba(255, 255, 255, .8);
-            border-radius: 1ex;
-        }
-
-        StatusLine;;;FontFixed  {
-            /* The status bar */
-            -moz-appearance: none !important;
-            font-weight: bold;
-            background: transparent !important;
-            border: 0px !important;
-            padding-right: 0px !important;
-            min-height: 18px !important;
-            text-shadow: none !important;
-        }
-        StatusLineNormal;[dactyl|highlight]    /* The status bar for an ordinary web page */ \
-                                               color: white !important; background: black   !important;
-        StatusLineBroken;[dactyl|highlight]    /* The status bar for a broken web page */ \
-                                               color: black !important; background: #FFa0a0 !important; /* light-red */
-        StatusLineSecure;[dactyl|highlight]    /* The status bar for a secure web page */ \
-                                               color: black !important; background: #a0a0FF !important; /* light-blue */
-        StatusLineExtended;[dactyl|highlight]  /* The status bar for a secure web page with an Extended Validation (EV) certificate */ \
-                                               color: black !important; background: #a0FFa0 !important; /* light-green */
-
-        !TabClose;.tab-close-button            /* The close button of a browser tab */ \
-                                               /* The close button of a browser tab */
-        !TabIcon;.tab-icon,.tab-icon-image     /* The icon of a browser tab */ \
-                                               /* The icon of a browser tab */
-        !TabText;.tab-text                     /* The text of a browser tab */
-        TabNumber                              /* The number of a browser tab, next to its icon */ \
-                                               font-weight: bold; margin: 0px; padding-right: .8ex; cursor: default;
-        TabIconNumber  {
-            /* The number of a browser tab, over its icon */
-            cursor: default;
-            width: 16px;
-            margin: 0 2px 0 -18px !important;
-            font-weight: bold;
-            color: white;
-            text-align: center;
-            text-shadow: black -1px 0 1px, black 0 1px 1px, black 1px 0 1px, black 0 -1px 1px;
-        }
-
-        Title       /* The title of a listing, including <ex>:pageinfo</ex>, <ex>:jumps</ex> */ \
-                    color: magenta; font-weight: bold;
-        URL         /* A URL */ \
-                    text-decoration: none; color: green; background: inherit;
-        URL:hover   text-decoration: underline; cursor: pointer;
-        URLExtra    /* Extra information about a URL */ \
-                    color: gray;
-
-        FrameIndicator;;* {
-            /* The styling applied to briefly indicate the active frame */
-            background-color: red;
-            opacity: 0.5;
-            z-index: 999999;
-            position: fixed;
-            top:      0;
-            bottom:   0;
-            left:     0;
-            right:    0;
-        }
-
-        Bell          /* &dactyl.appName;’s visual bell */ \
-                      background-color: black !important;
-
-        Hint;;* {
-            /* A hint indicator. See <ex>:help hints</ex> */
-            font:        bold 10px "Droid Sans Mono", monospace !important;
-            margin:      -.2ex;
-            padding:     0 0 0 1px;
-            outline:     1px solid rgba(0, 0, 0, .5);
-            background:  rgba(255, 248, 231, .8);
-            color:       black;
-        }
-        Hint[active];;*  background: rgba(255, 253, 208, .8);
-        Hint::after;;*   content: attr(text) !important;
-        HintElem;;*      /* The hintable element */ \
-                         background-color: yellow  !important; color: black !important;
-        HintActive;;*    /* The hint element of link which will be followed by <k name="CR"/> */ \
-                         background-color: #88FF00 !important; color: black !important;
-        HintImage;;*     /* The indicator which floats above hinted images */ \
-                         opacity: .5 !important;
-
-        Button                  /* A button widget */ \
-                                display: inline-block; font-weight: bold; cursor: pointer; color: black; text-decoration: none;
-        Button:hover            text-decoration: underline;
-        Button[collapsed]       visibility: collapse; width: 0;
-        Button::before          content: "["; color: gray; text-decoration: none !important;
-        Button::after           content: "]"; color: gray; text-decoration: none !important;
-        Button:not([collapsed]) ~ Button:not([collapsed])::before  content: "/[";
-
-        Buttons                 /* A group of buttons */
-
-        DownloadCell                    /* A table cell in the :downloads manager */ \
-                                        display: table-cell; padding: 0 1ex;
-
-        Downloads                       /* The :downloads manager */ \
-                                        display: table; margin: 0; padding: 0;
-        DownloadHead;;;CompTitle        /* A heading in the :downloads manager */ \
-                                        display: table-row;
-        DownloadHead>*;;;DownloadCell
-
-        Download                        /* A download in the :downloads manager */ \
-                                        display: table-row;
-        Download:not([active])          color: gray;
-        Download:nth-child(2n+1)        background: rgba(0, 0, 0, .04);
-
-        Download>*;;;DownloadCell
-        DownloadButtons                 /* A button group in the :downloads manager */
-        DownloadPercent                 /* The percentage column for a download */
-        DownloadProgress                /* The progress column for a download */
-        DownloadProgressHave            /* The completed portion of the progress column */
-        DownloadProgressTotal           /* The remaining portion of the progress column */
-        DownloadSource                  /* The download source column for a download */
-        DownloadState                   /* The download state column for a download */
-        DownloadTime                    /* The time remaining column for a download */
-        DownloadTitle                   /* The title column for a download */
-        DownloadTitle>Link>a         max-width: 48ex; overflow: hidden; display: inline-block;
-
-        AddonCell                    /* A cell in tell :addons manager */ \
-                                     display: table-cell; padding: 0 1ex;
-
-        Addons                       /* The :addons manager */ \
-                                     display: table; margin: 0; padding: 0;
-        AddonHead;;;CompTitle        /* A heading in the :addons manager */ \
-                                     display: table-row;
-        AddonHead>*;;;AddonCell
-
-        Addon                        /* An add-on in the :addons manager */ \
-                                     display: table-row;
-        Addon:nth-child(2n+1)        background: rgba(0, 0, 0, .04);
-
-        Addon>*;;;AddonCell
-        AddonButtons
-        AddonDescription
-        AddonName                    max-width: 48ex; overflow: hidden;
-        AddonStatus
-        AddonVersion
-
-        // </css>
-    ]]></>, /&#x0d;/g, "\n")),
-
-    helpCSS: UTF8(<><![CDATA[
-        // <css>
-        InlineHelpLink                              /* A help link shown in the command line or multi-line output area */ \
-                                                    font-size: inherit !important; font-family: inherit !important;
-
-        Help;;;FontProportional                     /* A help page */ \
-                                                    line-height: 1.4em;
-
-        HelpInclude                                 /* A help page included in the consolidated help listing */ \
-                                                    margin: 2em 0;
-
-        HelpArg;;;FontCode                          /* A required command argument indicator */ \
-                                                    color: #6A97D4;
-        HelpOptionalArg;;;FontCode                  /* An optional command argument indicator */ \
-                                                    color: #6A97D4;
-
-        HelpBody                                    /* The body of a help page */ \
-                                                    display: block; margin: 1em auto; max-width: 100ex; padding-bottom: 1em; margin-bottom: 4em; border-bottom-width: 1px;
-        HelpBorder;*;dactyl://help/*                /* The styling of bordered elements */ \
-                                                    border-color: silver; border-width: 0px; border-style: solid;
-        HelpCode;;;FontCode                         /* Code listings */ \
-                                                    display: block; white-space: pre; margin-left: 2em;
-        HelpTT;html|tt;dactyl://help/*;FontCode     /* Teletype text */
-
-        HelpDefault;;;FontCode                      /* The default value of a help item */ \
-                                                    display: inline-block; margin: -1px 1ex 0 0; white-space: pre; vertical-align: text-top;
-
-        HelpDescription                             /* The description of a help item */ \
-                                                    display: block; clear: right;
-        HelpDescription[short]                      clear: none;
-        HelpEm;html|em;dactyl://help/*              /* Emphasized text */ \
-                                                    font-weight: bold; font-style: normal;
-
-        HelpEx;;;FontCode                           /* An Ex command */ \
-                                                    display: inline-block; color: #527BBD;
-
-        HelpExample                                 /* An example */ \
-                                                    display: block; margin: 1em 0;
-        HelpExample::before                         content: "__MSG_help.Example__: "; font-weight: bold;
-
-        HelpInfo                                    /* Arbitrary information about a help item */ \
-                                                    display: block; width: 20em; margin-left: auto;
-        HelpInfoLabel                               /* The label for a HelpInfo item */ \
-                                                    display: inline-block; width: 6em;  color: magenta; font-weight: bold; vertical-align: text-top;
-        HelpInfoValue                               /* The details for a HelpInfo item */ \
-                                                    display: inline-block; width: 14em; text-decoration: none;             vertical-align: text-top;
-
-        HelpItem                                    /* A help item */ \
-                                                    display: block; margin: 1em 1em 1em 10em; clear: both;
-
-        HelpKey;;;FontCode                          /* A keyboard key specification */ \
-                                                    color: #102663;
-        HelpKeyword                                 /* A keyword */ \
-                                                    font-weight: bold; color: navy;
-
-        HelpLink;html|a;dactyl://help/*             /* A hyperlink */ \
-                                                    text-decoration: none !important;
-        HelpLink[href]:hover                        text-decoration: underline !important;
-        HelpLink[href^="mailto:"]::after            content: "✉"; padding-left: .2em;
-        HelpLink[rel=external] {
-            /* A hyperlink to an external resource */
-            /* Thanks, Wikipedia */
-            background: transparent url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAMAAAC67D+PAAAAFVBMVEVmmcwzmcyZzP8AZswAZv////////9E6giVAAAAB3RSTlP///////8AGksDRgAAADhJREFUGFcly0ESAEAEA0Ei6/9P3sEcVB8kmrwFyni0bOeyyDpy9JTLEaOhQq7Ongf5FeMhHS/4AVnsAZubxDVmAAAAAElFTkSuQmCC) no-repeat scroll right center;
-            padding-right: 13px;
-        }
-
-        ErrorMsg HelpEx       color: inherit; background: inherit; text-decoration: underline;
-        ErrorMsg HelpKey      color: inherit; background: inherit; text-decoration: underline;
-        ErrorMsg HelpOption   color: inherit; background: inherit; text-decoration: underline;
-        ErrorMsg HelpTopic    color: inherit; background: inherit; text-decoration: underline;
-
-        HelpTOC               /* The Table of Contents for a help page */
-        HelpTOC>ol ol         margin-left: -1em;
-
-        HelpOrderedList;ol;dactyl://help/*                          /* Any ordered list */ \
-                                                                    margin: 1em 0;
-        HelpOrderedList1;ol[level="1"],ol;dactyl://help/*           /* A first-level ordered list */ \
-                                                                    list-style: outside decimal; display: block;
-        HelpOrderedList2;ol[level="2"],ol ol;dactyl://help/*        /* A second-level ordered list */ \
-                                                                    list-style: outside upper-alpha;
-        HelpOrderedList3;ol[level="3"],ol ol ol;dactyl://help/*     /* A third-level ordered list */ \
-                                                                    list-style: outside lower-roman;
-        HelpOrderedList4;ol[level="4"],ol ol ol ol;dactyl://help/*  /* A fourth-level ordered list */ \
-                                                                    list-style: outside decimal;
-
-        HelpList;html|ul;dactyl://help/*      /* An unordered list */ \
-                                              display: block; list-style-position: outside; margin: 1em 0;
-        HelpListItem;html|li;dactyl://help/*  /* A list item, ordered or unordered */ \
-                                              display: list-item;
-
-        HelpNote                                    /* The indicator for a note */ \
-                                                    color: red; font-weight: bold;
-
-        HelpOpt;;;FontCode                          /* An option name */ \
-                                                    color: #106326;
-        HelpOptInfo;;;FontCode                      /* Information about the type and default values for an option entry */ \
-                                                    display: block; margin-bottom: 1ex; padding-left: 4em;
-
-        HelpParagraph;html|p;dactyl://help/*        /* An ordinary paragraph */ \
-                                                    display: block; margin: 1em 0em;
-        HelpParagraph:first-child                   margin-top: 0;
-        HelpParagraph:last-child                    margin-bottom: 0;
-        HelpSpec;;;FontCode                         /* The specification for a help entry */ \
-                                                    display: block; margin-left: -10em; float: left; clear: left; color: #527BBD; margin-right: 1em;
-
-        HelpString;;;FontCode                       /* A quoted string */ \
-                                                    color: green; font-weight: normal;
-        HelpString::before                          content: '"';
-        HelpString::after                           content: '"';
-        HelpString[delim]::before                   content: attr(delim);
-        HelpString[delim]::after                    content: attr(delim);
-
-        HelpNews        /* A news item */           position: relative;
-        HelpNewsOld     /* An old news item */      opacity: .7;
-        HelpNewsNew     /* A new news item */       font-style: italic;
-        HelpNewsTag     /* The version tag for a news item */ \
-                        font-style: normal; position: absolute; left: 100%; padding-left: 1em; color: #527BBD; opacity: .6; white-space: pre;
-
-        HelpHead;html|h1,html|h2,html|h3,html|h4;dactyl://help/* {
-            /* Any help heading */
-            font-weight: bold;
-            color: #527BBD;
-            clear: both;
-        }
-        HelpHead1;html|h1;dactyl://help/* {
-            /* A first-level help heading */
-            margin: 2em 0 1em;
-            padding-bottom: .2ex;
-            border-bottom-width: 1px;
-            font-size: 2em;
-        }
-        HelpHead2;html|h2;dactyl://help/* {
-            /* A second-level help heading */
-            margin: 2em 0 1em;
-            padding-bottom: .2ex;
-            border-bottom-width: 1px;
-            font-size: 1.2em;
-        }
-        HelpHead3;html|h3;dactyl://help/* {
-            /* A third-level help heading */
-            margin: 1em 0;
-            padding-bottom: .2ex;
-            font-size: 1.1em;
-        }
-        HelpHead4;html|h4;dactyl://help/* {
-            /* A fourth-level help heading */
-        }
-
-        HelpTab;html|dl;dactyl://help/* {
-            /* A description table */
-            display: table;
-            width: 100%;
-            margin: 1em 0;
-            border-bottom-width: 1px;
-            border-top-width: 1px;
-            padding: .5ex 0;
-            table-layout: fixed;
-        }
-        HelpTabColumn;html|column;dactyl://help/*   display: table-column;
-        HelpTabColumn:first-child                   width: 25%;
-        HelpTabTitle;html|dt;dactyl://help/*;FontCode  /* The title column of description tables */ \
-                                                    display: table-cell; padding: .1ex 1ex; font-weight: bold;
-        HelpTabDescription;html|dd;dactyl://help/*  /* The description column of description tables */ \
-                                                    display: table-cell; padding: .3ex 1em; text-indent: -1em; border-width: 0px;
-        HelpTabDescription>*;;dactyl://help/*       text-indent: 0;
-        HelpTabRow;html|dl>html|tr;dactyl://help/*  /* Entire rows in description tables */ \
-                                                    display: table-row;
-
-        HelpTag;;;FontCode                          /* A help tag */ \
-                                                    display: inline-block; color: #527BBD; margin-left: 1ex; font-weight: normal;
-        HelpTags                                    /* A group of help tags */ \
-                                                    display: block; float: right; clear: right;
-        HelpTopic;;;FontCode                        /* A link to a help topic */ \
-                                                    color: #102663;
-        HelpType;;;FontCode                         /* An option type */ \
-                                                    color: #102663 !important; margin-right: 2ex;
-
-        HelpWarning                                 /* The indicator for a warning */ \
-                                                    color: red; font-weight: bold;
-
-        HelpXML;;;FontCode  {
-            /* Highlighted XML */
-            white-space: pre;
-            display: inline-block;
-            color: #C5F779;
-            background-color: #444444;
-            border: 1px dashed #aaaaaa;
-            font-family: Terminus, Fixed, monospace;
-        }
-        HelpXMLBlock;;;HelpXML {
-            display: block;
-            margin-left: 2em;
-        }
-        HelpXMLAttribute                            color: #C5F779;
-        HelpXMLAttribute::after                     color: #E5E5E5; content: "=";
-        HelpXMLComment                              color: #444444;
-        HelpXMLComment::before                      content: "<!--";
-        HelpXMLComment::after                       content: "-->";
-        HelpXMLProcessing                           color: #C5F779;
-        HelpXMLProcessing::before                   color: #444444; content: "<?";
-        HelpXMLProcessing::after                    color: #444444; content: "?>";
-        HelpXMLString                               color: #C5F779; white-space: pre;
-        HelpXMLString::before                       content: '"';
-        HelpXMLString::after                        content: '"';
-        HelpXMLNamespace                            color: #FFF796;
-        HelpXMLNamespace::after                     color: #777777; content: ":";
-        HelpXMLTagStart                             color: #FFF796; white-space: normal; display: inline-block; text-indent: -1.5em; padding-left: 1.5em;
-        HelpXMLTagEnd                               color: #71BEBE;
-        HelpXMLText                                 color: #E5E5E5;
-
-        CompItem HelpXMLTagStart                    white-space: pre;
-        // </css>
-    ]]></>)
+    helpCSS: Class.Memoize(function () File.readURL("resource://dactyl-skin/help-styles.css"))
 }, {
 });
-
 JSMLoader.loadSubScript("resource://dactyl-local-content/config.js", this);
 
 config.INIT = update(Object.create(config.INIT), config.INIT, {
diff --git a/common/modules/main.jsm b/common/modules/main.jsm
index d6f18597..d23cd02e 100644
--- a/common/modules/main.jsm
+++ b/common/modules/main.jsm
@@ -168,7 +168,7 @@ var Modules = function Modules(window) {
 
 config.loadStyles();
 
-overlay.overlayWindow(config.overlayChrome, function _overlay(window) ({
+overlay.overlayWindow(Object.keys(config.overlays), function _overlay(window) ({
     ready: function onInit(document) {
         const modules = Modules(window);
         window.dactyl = { modules: modules };
diff --git a/common/modules/options.jsm b/common/modules/options.jsm
index 8547a13c..f3fefc98 100644
--- a/common/modules/options.jsm
+++ b/common/modules/options.jsm
@@ -53,8 +53,8 @@ var Option = Class("Option", {
         if (extraInfo)
             this.update(extraInfo);
 
-        if (Set.has(this.modules.config.defaults, this.name))
-            defaultValue = this.modules.config.defaults[this.name];
+        if (Set.has(this.modules.config.optionDefaults, this.name))
+            defaultValue = this.modules.config.optionDefaults[this.name];
 
         if (defaultValue == null && this.getter)
             defaultValue = this.getter();
diff --git a/common/modules/sanitizer.jsm b/common/modules/sanitizer.jsm
index 37ae8de6..e0c9f998 100644
--- a/common/modules/sanitizer.jsm
+++ b/common/modules/sanitizer.jsm
@@ -12,14 +12,14 @@
 // FIXME:
 //   - finish 1.9.0 support if we're going to support sanitizing in Melodactyl
 
-try {
-
 Components.utils.import("resource://dactyl/bootstrap.jsm");
 defineModule("sanitizer", {
     exports: ["Range", "Sanitizer", "sanitizer"],
-    require: ["messages", "prefs", "services", "storage", "template", "util"]
+    require: ["config", "prefs", "services", "storage", "template", "util"]
 }, this);
 
+this.lazyRequire("messages", ["_"]);
+
 let tmp = {};
 JSMLoader.loadSubScript("chrome://browser/content/sanitize.js", tmp);
 tmp.Sanitizer.prototype.__proto__ = Class.prototype;
@@ -705,6 +705,6 @@ var Sanitizer = Module("sanitizer", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakRef
 
 endModule();
 
-} catch(e){dump(e.fileName+":"+e.lineNumber+": "+e+"\n" + e.stack);}
+// catch(e){dump(e.fileName+":"+e.lineNumber+": "+e+"\n" + e.stack);}
 
 // vim: set fdm=marker sw=4 ts=4 et ft=javascript:
diff --git a/common/modules/storage.jsm b/common/modules/storage.jsm
index 119f962b..eda8391b 100644
--- a/common/modules/storage.jsm
+++ b/common/modules/storage.jsm
@@ -536,7 +536,7 @@ var File = Class("File", {
 
     pathSplit: Class.Memoize(function () util.regexp("(?:/|" + util.regexp.escape(this.PATH_SEP) + ")", "g")),
 
-    DoesNotExist: function (path, error) ({
+    DoesNotExist: function DoesNotExist(path, error) ({
         path: path,
         exists: function () false,
         __noSuchMethod__: function () { throw error || Error("Does not exist"); }
@@ -559,7 +559,7 @@ var File = Class("File", {
      * @param {boolean} relative Whether the path is relative or absolute.
      * @returns {string}
      */
-    expandPath: function (path, relative) {
+    expandPath: function expandPath(path, relative) {
         function getenv(name) services.environment.get(name);
 
         // expand any $ENV vars - this is naive but so is Vim and we like to be compatible
@@ -595,7 +595,13 @@ var File = Class("File", {
 
     expandPathList: function (list) list.map(this.expandPath),
 
-    readStream: function (ifstream, encoding) {
+    readURL: function readURL(url, encoding) {
+        let channel = services.io.newChannel(url, null, null);
+        channel.contentType = "text/plain";
+        return this.readStream(channel.open(), encoding);
+    },
+
+    readStream: function readStream(ifstream, encoding) {
         try {
             var icstream = services.CharsetStream(
                     ifstream, encoding || File.defaultEncoding, 4096, // buffer size
@@ -613,7 +619,7 @@ var File = Class("File", {
         }
     },
 
-    readLines: function (ifstream, encoding) {
+    readLines: function readLines(ifstream, encoding) {
         try {
             var icstream = services.CharsetStream(
                     ifstream, encoding || File.defaultEncoding, 4096, // buffer size
@@ -630,7 +636,7 @@ var File = Class("File", {
     },
 
 
-    isAbsolutePath: function (path) {
+    isAbsolutePath: function isAbsolutePath(path) {
         try {
             services.File().initWithPath(path);
             return true;
@@ -640,7 +646,7 @@ var File = Class("File", {
         }
     },
 
-    joinPaths: function (head, tail, cwd) {
+    joinPaths: function joinPaths(head, tail, cwd) {
         let path = this(head, cwd);
         try {
             // FIXME: should only expand environment vars and normalize path separators
diff --git a/common/skin/global-styles.css b/common/skin/global-styles.css
new file mode 100644
index 00000000..adcf325c
--- /dev/null
+++ b/common/skin/global-styles.css
@@ -0,0 +1,309 @@
+
+Boolean      /* JavaScript booleans */       color: red;
+Function     /* JavaScript functions */      color: navy;
+Null         /* JavaScript null values */    color: blue;
+Number       /* JavaScript numbers */        color: blue;
+Object       /* JavaScript objects */        color: maroon;
+String       /* String values */             color: green; white-space: pre;
+Comment      /* JavaScriptor CSS comments */ color: gray;
+
+Key          /* Keywords */                  font-weight: bold;
+
+Enabled      /* Enabled item indicator text */  color: blue;
+Disabled     /* Disabled item indicator text */ color: red;
+
+FontFixed           /* The font used for fixed-width text */ \
+                    font-family: monospace !important;
+FontCode            /* The font used for code listings */ \
+                    font-size: 9pt;  font-family: monospace !important;
+FontProportional    /* The font used for proportionally spaced text */ \
+                    font-size: 10pt; font-family: "Droid Sans", "Helvetica LT Std", Helvetica, "DejaVu Sans", Verdana, sans-serif !important;
+
+    // Hack to give these groups slightly higher precedence
+    // than their unadorned variants.
+    CmdCmdLine;[dactyl|highlight]>*
+    CmdErrorMsg;[dactyl|highlight]
+    CmdInfoMsg;[dactyl|highlight]
+    CmdModeMsg;[dactyl|highlight]
+    CmdMoreMsg;[dactyl|highlight]
+    CmdNormal;[dactyl|highlight]
+    CmdQuestion;[dactyl|highlight]
+    CmdWarningMsg;[dactyl|highlight]
+
+    StatusCmdLine;[dactyl|highlight]>*
+    StatusErrorMsg;[dactyl|highlight]
+    StatusInfoMsg;[dactyl|highlight]
+    StatusModeMsg;[dactyl|highlight]
+    StatusMoreMsg;[dactyl|highlight]
+    StatusNormal;[dactyl|highlight]
+    StatusQuestion;[dactyl|highlight]
+    StatusWarningMsg;[dactyl|highlight]
+
+Normal            /* Normal text */ \
+                  color: black   !important; background: white       !important; font-weight: normal !important;
+StatusNormal      /* Normal text in the status line */ \
+                  color: inherit !important; background: transparent !important;
+ErrorMsg          /* Error messages */ \
+                  color: white   !important; background: red         !important; font-weight: bold !important;
+InfoMsg           /* Information messages */ \
+                  color: black   !important; background: white       !important;
+StatusInfoMsg     /* Information messages in the status line */ \
+                  color: inherit !important; background: transparent !important;
+LineNr            /* The line number of an error */ \
+                  color: orange  !important; background: white       !important;
+ModeMsg           /* The mode indicator */ \
+                  color: black   !important; background: white       !important;
+StatusModeMsg     /* The mode indicator in the status line */ \
+                  color: inherit !important; background: transparent !important; padding-right: 1em;
+MoreMsg           /* The indicator that there is more text to view */ \
+                  color: green   !important; background: white       !important;
+StatusMoreMsg                                background: transparent !important;
+Message           /* A message as displayed in <ex>:messages</ex> */ \
+                  white-space: pre-wrap !important; min-width: 100%; width: 100%; padding-left: 4em; text-indent: -4em; display: block;
+Message String    /* A message as displayed in <ex>:messages</ex> */ \
+                  white-space: pre-wrap;
+NonText           /* The <em>~</em> indicators which mark blank lines in the completion list */ \
+                  color: blue; background: transparent !important;
+*Preview          /* The completion preview displayed in the &tag.command-line; */ \
+                  color: gray;
+Question          /* A prompt for a decision */ \
+                  color: green   !important; background: white       !important; font-weight: bold !important;
+StatusQuestion    /* A prompt for a decision in the status line */ \
+                  color: green   !important; background: transparent !important;
+WarningMsg        /* A warning message */ \
+                  color: red     !important; background: white       !important;
+StatusWarningMsg  /* A warning message in the status line */ \
+                  color: red     !important; background: transparent !important;
+Disabled          /* Disabled items */ \
+                  color: gray    !important;
+
+CmdLine;>*;;FontFixed   /* The command line */ \
+                        padding: 1px !important;
+CmdPrompt;.dactyl-commandline-prompt  /* The default styling form the command prompt */
+CmdInput;.dactyl-commandline-command
+CmdOutput         /* The output of commands executed by <ex>:run</ex> */ \
+                  white-space: pre;
+
+CompGroup                      /* Item group in completion output */
+CompGroup:not(:first-of-type)  margin-top: .5em;
+CompGroup:last-of-type         padding-bottom: 1.5ex;
+
+CompTitle            /* Completion row titles */ \
+                     color: magenta; background: white; font-weight: bold;
+CompTitle>*          padding: 0 .5ex;
+CompTitleSep         /* The element which separates the completion title from its results */ \
+                     height: 1px; background: magenta; background: -moz-linear-gradient(60deg, magenta, white);
+
+CompMsg              /* The message which may appear at the top of a group of completion results */ \
+                     font-style: italic; margin-left: 16px;
+
+CompItem             /* A single row of output in the completion list */
+CompItem:nth-child(2n+1)    background: rgba(0, 0, 0, .04);
+CompItem[selected]   /* A selected row of completion list */ \
+                     background: yellow;
+CompItem>*           padding: 0 .5ex;
+
+CompIcon             /* The favicon of a completion row */ \
+                     width: 16px; min-width: 16px; display: inline-block; margin-right: .5ex;
+CompIcon>img         max-width: 16px; max-height: 16px; vertical-align: middle;
+
+CompResult           /* The result column of the completion list */ \
+                     width: 36%; padding-right: 1%; overflow: hidden;
+CompDesc             /* The description column of the completion list */ \
+                     color: gray; width: 62%; padding-left: 1em;
+
+CompLess             /* The indicator shown when completions may be scrolled up */ \
+                     text-align: center; height: 0;    line-height: .5ex; padding-top: 1ex;
+CompLess::after      /* The character of indicator shown when completions may be scrolled up */ \
+                     content: "⌃";
+
+CompMore             /* The indicator shown when completions may be scrolled down */ \
+                     text-align: center; height: .5ex; line-height: .5ex; margin-bottom: -.5ex;
+CompMore::after      /* The character of indicator shown when completions may be scrolled down */ \
+                     content: "⌄";
+
+Dense              /* Arbitrary elements which should be packed densely together */\
+                   margin-top: 0; margin-bottom: 0;
+
+EditorEditing;;*   /* Text fields for which an external editor is open */ \
+                   background-color: #bbb !important; -moz-user-input: none !important; -moz-user-modify: read-only !important;
+EditorError;;*     /* Text fields briefly after an error has occurred running the external editor */ \
+                   background: red !important;
+EditorBlink1;;*    /* Text fields briefly after successfully running the external editor, alternated with EditorBlink2 */ \
+                   background: yellow !important;
+EditorBlink2;;*    /* Text fields briefly after successfully running the external editor, alternated with EditorBlink1 */
+
+REPL                /* Read-Eval-Print-Loop output */ \
+                    overflow: auto; max-height: 40em;
+REPL-R;;;Question   /* Prompts in REPL mode */
+REPL-E              /* Evaled input in REPL mode */ \
+                    white-space: pre-wrap;
+REPL-P              /* Evaled output in REPL mode */ \
+                    white-space: pre-wrap; margin-bottom: 1em;
+
+Usage               /* Output from the :*usage commands */ \
+                    width: 100%;
+UsageHead           /* Headings in output from the :*usage commands */
+UsageBody           /* The body of listings in output from the :*usage commands */
+UsageItem           /* Individual items in output from the :*usage commands */
+UsageItem:nth-of-type(2n)    background: rgba(0, 0, 0, .04);
+
+Indicator   /* The <em>#</em> and  <em>%</em> in the <ex>:buffers</ex> list */ \
+            color: blue; width: 1.5em; text-align: center;
+Filter      /* The matching text in a completion list */ \
+            font-weight: bold;
+
+Keyword     /* A bookmark keyword for a URL */ \
+            color: red;
+Tag         /* A bookmark tag for a URL */ \
+            color: blue;
+
+Link                        /* A link with additional information shown on hover */ \
+                            position: relative; padding-right: 2em;
+Link:not(:hover)>LinkInfo   opacity: 0; left: 0; width: 1px; height: 1px; overflow: hidden;
+LinkInfo                    {
+    /* Information shown when hovering over a link */
+    color: black;
+    position: absolute;
+    left: 100%;
+    padding: 1ex;
+    margin: -1ex -1em;
+    background: rgba(255, 255, 255, .8);
+    border-radius: 1ex;
+}
+
+StatusLine;;;FontFixed  {
+    /* The status bar */
+    -moz-appearance: none !important;
+    font-weight: bold;
+    background: transparent !important;
+    border: 0px !important;
+    padding-right: 0px !important;
+    min-height: 18px !important;
+    text-shadow: none !important;
+}
+StatusLineNormal;[dactyl|highlight]    /* The status bar for an ordinary web page */ \
+                                       color: white !important; background: black   !important;
+StatusLineBroken;[dactyl|highlight]    /* The status bar for a broken web page */ \
+                                       color: black !important; background: #FFa0a0 !important; /* light-red */
+StatusLineSecure;[dactyl|highlight]    /* The status bar for a secure web page */ \
+                                       color: black !important; background: #a0a0FF !important; /* light-blue */
+StatusLineExtended;[dactyl|highlight]  /* The status bar for a secure web page with an Extended Validation (EV) certificate */ \
+                                       color: black !important; background: #a0FFa0 !important; /* light-green */
+
+!TabClose;.tab-close-button            /* The close button of a browser tab */ \
+                                       /* The close button of a browser tab */
+!TabIcon;.tab-icon,.tab-icon-image     /* The icon of a browser tab */ \
+                                       /* The icon of a browser tab */
+!TabText;.tab-text                     /* The text of a browser tab */
+TabNumber                              /* The number of a browser tab, next to its icon */ \
+                                       font-weight: bold; margin: 0px; padding-right: .8ex; cursor: default;
+TabIconNumber  {
+    /* The number of a browser tab, over its icon */
+    cursor: default;
+    width: 16px;
+    margin: 0 2px 0 -18px !important;
+    font-weight: bold;
+    color: white;
+    text-align: center;
+    text-shadow: black -1px 0 1px, black 0 1px 1px, black 1px 0 1px, black 0 -1px 1px;
+}
+
+Title       /* The title of a listing, including <ex>:pageinfo</ex>, <ex>:jumps</ex> */ \
+            color: magenta; font-weight: bold;
+URL         /* A URL */ \
+            text-decoration: none; color: green; background: inherit;
+URL:hover   text-decoration: underline; cursor: pointer;
+URLExtra    /* Extra information about a URL */ \
+            color: gray;
+
+FrameIndicator;;* {
+    /* The styling applied to briefly indicate the active frame */
+    background-color: red;
+    opacity: 0.5;
+    z-index: 999999;
+    position: fixed;
+    top:      0;
+    bottom:   0;
+    left:     0;
+    right:    0;
+}
+
+Bell          /* &dactyl.appName;’s visual bell */ \
+              background-color: black !important;
+
+Hint;;* {
+    /* A hint indicator. See <ex>:help hints</ex> */
+    font:        bold 10px "Droid Sans Mono", monospace !important;
+    margin:      -.2ex;
+    padding:     0 0 0 1px;
+    outline:     1px solid rgba(0, 0, 0, .5);
+    background:  rgba(255, 248, 231, .8);
+    color:       black;
+}
+Hint[active];;*  background: rgba(255, 253, 208, .8);
+Hint::after;;*   content: attr(text) !important;
+HintElem;;*      /* The hintable element */ \
+                 background-color: yellow  !important; color: black !important;
+HintActive;;*    /* The hint element of link which will be followed by <k name="CR"/> */ \
+                 background-color: #88FF00 !important; color: black !important;
+HintImage;;*     /* The indicator which floats above hinted images */ \
+                 opacity: .5 !important;
+
+Button                  /* A button widget */ \
+                        display: inline-block; font-weight: bold; cursor: pointer; color: black; text-decoration: none;
+Button:hover            text-decoration: underline;
+Button[collapsed]       visibility: collapse; width: 0;
+Button::before          content: "["; color: gray; text-decoration: none !important;
+Button::after           content: "]"; color: gray; text-decoration: none !important;
+Button:not([collapsed]) ~ Button:not([collapsed])::before  content: "/[";
+
+Buttons                 /* A group of buttons */
+
+DownloadCell                    /* A table cell in the :downloads manager */ \
+                                display: table-cell; padding: 0 1ex;
+
+Downloads                       /* The :downloads manager */ \
+                                display: table; margin: 0; padding: 0;
+DownloadHead;;;CompTitle        /* A heading in the :downloads manager */ \
+                                display: table-row;
+DownloadHead>*;;;DownloadCell
+
+Download                        /* A download in the :downloads manager */ \
+                                display: table-row;
+Download:not([active])          color: gray;
+Download:nth-child(2n+1)        background: rgba(0, 0, 0, .04);
+
+Download>*;;;DownloadCell
+DownloadButtons                 /* A button group in the :downloads manager */
+DownloadPercent                 /* The percentage column for a download */
+DownloadProgress                /* The progress column for a download */
+DownloadProgressHave            /* The completed portion of the progress column */
+DownloadProgressTotal           /* The remaining portion of the progress column */
+DownloadSource                  /* The download source column for a download */
+DownloadState                   /* The download state column for a download */
+DownloadTime                    /* The time remaining column for a download */
+DownloadTitle                   /* The title column for a download */
+DownloadTitle>Link>a         max-width: 48ex; overflow: hidden; display: inline-block;
+
+AddonCell                    /* A cell in tell :addons manager */ \
+                             display: table-cell; padding: 0 1ex;
+
+Addons                       /* The :addons manager */ \
+                             display: table; margin: 0; padding: 0;
+AddonHead;;;CompTitle        /* A heading in the :addons manager */ \
+                             display: table-row;
+AddonHead>*;;;AddonCell
+
+Addon                        /* An add-on in the :addons manager */ \
+                             display: table-row;
+Addon:nth-child(2n+1)        background: rgba(0, 0, 0, .04);
+
+Addon>*;;;AddonCell
+AddonButtons
+AddonDescription
+AddonName                    max-width: 48ex; overflow: hidden;
+AddonStatus
+AddonVersion
+
+// vim:se sts=4 sw=4 et ft=css:
diff --git a/common/skin/help-styles.css b/common/skin/help-styles.css
new file mode 100644
index 00000000..9c7289c9
--- /dev/null
+++ b/common/skin/help-styles.css
@@ -0,0 +1,212 @@
+
+InlineHelpLink                              /* A help link shown in the command line or multi-line output area */ \
+                                            font-size: inherit !important; font-family: inherit !important;
+
+Help;;;FontProportional                     /* A help page */ \
+                                            line-height: 1.4em;
+
+HelpInclude                                 /* A help page included in the consolidated help listing */ \
+                                            margin: 2em 0;
+
+HelpArg;;;FontCode                          /* A required command argument indicator */ \
+                                            color: #6A97D4;
+HelpOptionalArg;;;FontCode                  /* An optional command argument indicator */ \
+                                            color: #6A97D4;
+
+HelpBody                                    /* The body of a help page */ \
+                                            display: block; margin: 1em auto; max-width: 100ex; padding-bottom: 1em; margin-bottom: 4em; border-bottom-width: 1px;
+HelpBorder;*;dactyl://help/*                /* The styling of bordered elements */ \
+                                            border-color: silver; border-width: 0px; border-style: solid;
+HelpCode;;;FontCode                         /* Code listings */ \
+                                            display: block; white-space: pre; margin-left: 2em;
+HelpTT;html|tt;dactyl://help/*;FontCode     /* Teletype text */
+
+HelpDefault;;;FontCode                      /* The default value of a help item */ \
+                                            display: inline-block; margin: -1px 1ex 0 0; white-space: pre; vertical-align: text-top;
+
+HelpDescription                             /* The description of a help item */ \
+                                            display: block; clear: right;
+HelpDescription[short]                      clear: none;
+HelpEm;html|em;dactyl://help/*              /* Emphasized text */ \
+                                            font-weight: bold; font-style: normal;
+
+HelpEx;;;FontCode                           /* An Ex command */ \
+                                            display: inline-block; color: #527BBD;
+
+HelpExample                                 /* An example */ \
+                                            display: block; margin: 1em 0;
+HelpExample::before                         content: "__MSG_help.Example__: "; font-weight: bold;
+
+HelpInfo                                    /* Arbitrary information about a help item */ \
+                                            display: block; width: 20em; margin-left: auto;
+HelpInfoLabel                               /* The label for a HelpInfo item */ \
+                                            display: inline-block; width: 6em;  color: magenta; font-weight: bold; vertical-align: text-top;
+HelpInfoValue                               /* The details for a HelpInfo item */ \
+                                            display: inline-block; width: 14em; text-decoration: none;             vertical-align: text-top;
+
+HelpItem                                    /* A help item */ \
+                                            display: block; margin: 1em 1em 1em 10em; clear: both;
+
+HelpKey;;;FontCode                          /* A keyboard key specification */ \
+                                            color: #102663;
+HelpKeyword                                 /* A keyword */ \
+                                            font-weight: bold; color: navy;
+
+HelpLink;html|a;dactyl://help/*             /* A hyperlink */ \
+                                            text-decoration: none !important;
+HelpLink[href]:hover                        text-decoration: underline !important;
+HelpLink[href^="mailto:"]::after            content: "✉"; padding-left: .2em;
+HelpLink[rel=external] {
+    /* A hyperlink to an external resource */
+    /* Thanks, Wikipedia */
+    background: transparent url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAMAAAC67D+PAAAAFVBMVEVmmcwzmcyZzP8AZswAZv////////9E6giVAAAAB3RSTlP///////8AGksDRgAAADhJREFUGFcly0ESAEAEA0Ei6/9P3sEcVB8kmrwFyni0bOeyyDpy9JTLEaOhQq7Ongf5FeMhHS/4AVnsAZubxDVmAAAAAElFTkSuQmCC) no-repeat scroll right center;
+    padding-right: 13px;
+}
+
+ErrorMsg HelpEx       color: inherit; background: inherit; text-decoration: underline;
+ErrorMsg HelpKey      color: inherit; background: inherit; text-decoration: underline;
+ErrorMsg HelpOption   color: inherit; background: inherit; text-decoration: underline;
+ErrorMsg HelpTopic    color: inherit; background: inherit; text-decoration: underline;
+
+HelpTOC               /* The Table of Contents for a help page */
+HelpTOC>ol ol         margin-left: -1em;
+
+HelpOrderedList;ol;dactyl://help/*                          /* Any ordered list */ \
+                                                            margin: 1em 0;
+HelpOrderedList1;ol[level="1"],ol;dactyl://help/*           /* A first-level ordered list */ \
+                                                            list-style: outside decimal; display: block;
+HelpOrderedList2;ol[level="2"],ol ol;dactyl://help/*        /* A second-level ordered list */ \
+                                                            list-style: outside upper-alpha;
+HelpOrderedList3;ol[level="3"],ol ol ol;dactyl://help/*     /* A third-level ordered list */ \
+                                                            list-style: outside lower-roman;
+HelpOrderedList4;ol[level="4"],ol ol ol ol;dactyl://help/*  /* A fourth-level ordered list */ \
+                                                            list-style: outside decimal;
+
+HelpList;html|ul;dactyl://help/*      /* An unordered list */ \
+                                      display: block; list-style-position: outside; margin: 1em 0;
+HelpListItem;html|li;dactyl://help/*  /* A list item, ordered or unordered */ \
+                                      display: list-item;
+
+HelpNote                                    /* The indicator for a note */ \
+                                            color: red; font-weight: bold;
+
+HelpOpt;;;FontCode                          /* An option name */ \
+                                            color: #106326;
+HelpOptInfo;;;FontCode                      /* Information about the type and default values for an option entry */ \
+                                            display: block; margin-bottom: 1ex; padding-left: 4em;
+
+HelpParagraph;html|p;dactyl://help/*        /* An ordinary paragraph */ \
+                                            display: block; margin: 1em 0em;
+HelpParagraph:first-child                   margin-top: 0;
+HelpParagraph:last-child                    margin-bottom: 0;
+HelpSpec;;;FontCode                         /* The specification for a help entry */ \
+                                            display: block; margin-left: -10em; float: left; clear: left; color: #527BBD; margin-right: 1em;
+
+HelpString;;;FontCode                       /* A quoted string */ \
+                                            color: green; font-weight: normal;
+HelpString::before                          content: '"';
+HelpString::after                           content: '"';
+HelpString[delim]::before                   content: attr(delim);
+HelpString[delim]::after                    content: attr(delim);
+
+HelpNews        /* A news item */           position: relative;
+HelpNewsOld     /* An old news item */      opacity: .7;
+HelpNewsNew     /* A new news item */       font-style: italic;
+HelpNewsTag     /* The version tag for a news item */ \
+                font-style: normal; position: absolute; left: 100%; padding-left: 1em; color: #527BBD; opacity: .6; white-space: pre;
+
+HelpHead;html|h1,html|h2,html|h3,html|h4;dactyl://help/* {
+    /* Any help heading */
+    font-weight: bold;
+    color: #527BBD;
+    clear: both;
+}
+HelpHead1;html|h1;dactyl://help/* {
+    /* A first-level help heading */
+    margin: 2em 0 1em;
+    padding-bottom: .2ex;
+    border-bottom-width: 1px;
+    font-size: 2em;
+}
+HelpHead2;html|h2;dactyl://help/* {
+    /* A second-level help heading */
+    margin: 2em 0 1em;
+    padding-bottom: .2ex;
+    border-bottom-width: 1px;
+    font-size: 1.2em;
+}
+HelpHead3;html|h3;dactyl://help/* {
+    /* A third-level help heading */
+    margin: 1em 0;
+    padding-bottom: .2ex;
+    font-size: 1.1em;
+}
+HelpHead4;html|h4;dactyl://help/* {
+    /* A fourth-level help heading */
+}
+
+HelpTab;html|dl;dactyl://help/* {
+    /* A description table */
+    display: table;
+    width: 100%;
+    margin: 1em 0;
+    border-bottom-width: 1px;
+    border-top-width: 1px;
+    padding: .5ex 0;
+    table-layout: fixed;
+}
+HelpTabColumn;html|column;dactyl://help/*   display: table-column;
+HelpTabColumn:first-child                   width: 25%;
+HelpTabTitle;html|dt;dactyl://help/*;FontCode  /* The title column of description tables */ \
+                                            display: table-cell; padding: .1ex 1ex; font-weight: bold;
+HelpTabDescription;html|dd;dactyl://help/*  /* The description column of description tables */ \
+                                            display: table-cell; padding: .3ex 1em; text-indent: -1em; border-width: 0px;
+HelpTabDescription>*;;dactyl://help/*       text-indent: 0;
+HelpTabRow;html|dl>html|tr;dactyl://help/*  /* Entire rows in description tables */ \
+                                            display: table-row;
+
+HelpTag;;;FontCode                          /* A help tag */ \
+                                            display: inline-block; color: #527BBD; margin-left: 1ex; font-weight: normal;
+HelpTags                                    /* A group of help tags */ \
+                                            display: block; float: right; clear: right;
+HelpTopic;;;FontCode                        /* A link to a help topic */ \
+                                            color: #102663;
+HelpType;;;FontCode                         /* An option type */ \
+                                            color: #102663 !important; margin-right: 2ex;
+
+HelpWarning                                 /* The indicator for a warning */ \
+                                            color: red; font-weight: bold;
+
+HelpXML;;;FontCode  {
+    /* Highlighted XML */
+    white-space: pre;
+    display: inline-block;
+    color: #C5F779;
+    background-color: #444444;
+    border: 1px dashed #aaaaaa;
+    font-family: Terminus, Fixed, monospace;
+}
+HelpXMLBlock;;;HelpXML {
+    display: block;
+    margin-left: 2em;
+}
+HelpXMLAttribute                            color: #C5F779;
+HelpXMLAttribute::after                     color: #E5E5E5; content: "=";
+HelpXMLComment                              color: #444444;
+HelpXMLComment::before                      content: "<!--";
+HelpXMLComment::after                       content: "-->";
+HelpXMLProcessing                           color: #C5F779;
+HelpXMLProcessing::before                   color: #444444; content: "<?";
+HelpXMLProcessing::after                    color: #444444; content: "?>";
+HelpXMLString                               color: #C5F779; white-space: pre;
+HelpXMLString::before                       content: '"';
+HelpXMLString::after                        content: '"';
+HelpXMLNamespace                            color: #FFF796;
+HelpXMLNamespace::after                     color: #777777; content: ":";
+HelpXMLTagStart                             color: #FFF796; white-space: normal; display: inline-block; text-indent: -1.5em; padding-left: 1.5em;
+HelpXMLTagEnd                               color: #71BEBE;
+HelpXMLText                                 color: #E5E5E5;
+
+CompItem HelpXMLTagStart                    white-space: pre;
+
+// vim:se sts=4 sw=4 et ft=css:
diff --git a/melodactyl/content/config.js b/melodactyl/content/config.js
index 0213a574..273a80cd 100644
--- a/melodactyl/content/config.js
+++ b/melodactyl/content/config.js
@@ -182,8 +182,6 @@ const Config = Module("config", ConfigBase, {
         song: "song"
     }, this.__proto__.completers)),
 
-    hasTabbrowser: true,
-
     removeTab: function (tab) {
         if (config.tabbrowser.mTabs.length > 1)
             config.tabbrowser.removeTab(tab);
diff --git a/pentadactyl/config.json b/pentadactyl/config.json
new file mode 100644
index 00000000..844c5f42
--- /dev/null
+++ b/pentadactyl/config.json
@@ -0,0 +1,86 @@
+{
+    "name": "pentadactyl",
+    "appName": "Pentadactyl",
+    "idName": "PENTADACTYL",
+    "host": "Firefox",
+    "hostbin": "firefox",
+
+    "autocommands": {
+        "BookmarkAdd":      "Triggered after a page is bookmarked",
+        "BookmarkChange":   "Triggered after a page's bookmark is changed",
+        "BookmarkRemove":   "Triggered after a page's bookmark is removed",
+        "ColorScheme":      "Triggered after a color scheme has been loaded",
+        "DOMLoad":          "Triggered when a page's DOM content has fully loaded",
+        "DownloadPost":     "Triggered when a download has completed",
+        "Fullscreen":       "Triggered when the browser's fullscreen state changes",
+        "LocationChange":   "Triggered when changing tabs or when navigation to a new location",
+        "PageLoadPre":      "Triggered after a page load is initiated",
+        "PageLoad":         "Triggered when a page gets (re)loaded/opened",
+        "PrivateMode":      "Triggered when private browsing mode is activated or deactivated",
+        "Sanitize":         "Triggered when a sanitizeable item is cleared",
+        "ShellCmdPost":     "Triggered after executing a shell command with :!cmd",
+        "Enter":            "Triggered after Firefox starts",
+        "LeavePre":         "Triggered before exiting Firefox, just before destroying each module",
+        "Leave":            "Triggered before exiting Firefox"
+    },
+
+    "option-defaults": {
+        "complete":     "search,location,file",
+        "guioptions":   "bCrs",
+        "showtabline":  "always",
+        "titlestring":  "Pentadactyl"
+    },
+
+    "features": [
+        "sanitizer",
+        "windows"
+    ],
+
+    "guioptions": {
+        "m": ["Menubar",      ["toolbar-menubar"]],
+        "T": ["Toolbar",      ["nav-bar"]],
+        "B": ["Bookmark bar", ["PersonalToolbar"]]
+    },
+
+    "overlays": {
+        "chrome://browser/content/browser.xul": {
+            "completers": {
+                "sidebar": "sidebar",
+                "window": "window"
+            },
+
+            "features": [
+                "bookmarks",
+                "hints",
+                "history",
+                "marks",
+                "quickmarks",
+                "session",
+                "tabbrowser",
+                "tabs",
+                "tabs_undo"
+            ],
+
+            "ids": {
+                "command-container": "browser-bottombox"
+            },
+
+            "scripts": [
+                "browser",
+                "bookmarkcache",
+                "bookmarks",
+                "history",
+                "quickmarks",
+                "sanitizer",
+                "tabs"
+            ]
+        }
+    },
+
+    "sidebars": {
+        "viewAddons":       ["Add-ons",     "A", "chrome://mozapps/content/extensions/extensions.xul"],
+        "viewConsole":      ["Console",     "C", "chrome://global/content/console.xul"],
+        "viewDownloads":    ["Downloads",   "D", "chrome://mozapps/content/downloads/downloads.xul"],
+        "viewPreferences":  ["Preferences", "P", "about:config"]
+    }
+}
diff --git a/pentadactyl/content/config.js b/pentadactyl/content/config.js
index 0b787978..6d8b200c 100644
--- a/pentadactyl/content/config.js
+++ b/pentadactyl/content/config.js
@@ -7,19 +7,9 @@
 "use strict";
 
 var Config = Module("config", ConfigBase, {
-    name: "pentadactyl",
-    appName: "Pentadactyl",
-    idName: "PENTADACTYL",
-    host: "Firefox",
-    hostbin: "firefox",
-
-    commandContainer: "browser-bottombox",
-
     Local: function Local(dactyl, modules, window)
         let ({ config } = modules) ({
 
-        completers: Class.Update({ sidebar: "sidebar", window: "window" }),
-
         dialogs: {
             about: ["About Firefox",
                 function () { window.openDialog("chrome://browser/content/aboutDialog.xul", "_blank", "chrome,dialog,modal,centerscreen"); }],
@@ -102,67 +92,8 @@ var Config = Module("config", ConfigBase, {
 
             return prefix + ".tmp";
         }
-    }),
+    })
 
-    overlayChrome: ["chrome://browser/content/browser.xul"],
-
-    styleableChrome: ["chrome://browser/content/browser.xul"],
-
-    autocommands: {
-        BookmarkAdd: "Triggered after a page is bookmarked",
-        BookmarkChange: "Triggered after a page's bookmark is changed",
-        BookmarkRemove: "Triggered after a page's bookmark is removed",
-        ColorScheme: "Triggered after a color scheme has been loaded",
-        DOMLoad: "Triggered when a page's DOM content has fully loaded",
-        DownloadPost: "Triggered when a download has completed",
-        Fullscreen: "Triggered when the browser's fullscreen state changes",
-        LocationChange: "Triggered when changing tabs or when navigation to a new location",
-        PageLoadPre: "Triggered after a page load is initiated",
-        PageLoad: "Triggered when a page gets (re)loaded/opened",
-        PrivateMode: "Triggered when private browsing mode is activated or deactivated",
-        Sanitize: "Triggered when a sanitizeable item is cleared",
-        ShellCmdPost: "Triggered after executing a shell command with :!cmd",
-        Enter: "Triggered after Firefox starts",
-        LeavePre: "Triggered before exiting Firefox, just before destroying each module",
-        Leave: "Triggered before exiting Firefox"
-    },
-
-    defaults: {
-        complete: "search,location,file",
-        guioptions: "bCrs",
-        showtabline: "always",
-        titlestring: "Pentadactyl"
-    },
-
-    features: Set([
-        "bookmarks", "hints", "history", "marks", "quickmarks", "sanitizer",
-        "session", "tabs", "tabs_undo", "windows"
-    ]),
-
-    guioptions: {
-        m: ["Menubar",      ["toolbar-menubar"]],
-        T: ["Toolbar",      ["nav-bar"]],
-        B: ["Bookmark bar", ["PersonalToolbar"]]
-    },
-
-    hasTabbrowser: true,
-
-    scripts: [
-        "browser",
-        "bookmarkcache",
-        "bookmarks",
-        "history",
-        "quickmarks",
-        "sanitizer",
-        "tabs"
-    ],
-
-    sidebars: {
-        viewAddons:      ["Add-ons",     "A", "chrome://mozapps/content/extensions/extensions.xul"],
-        viewConsole:     ["Console",     "C", "chrome://global/content/console.xul"],
-        viewDownloads:   ["Downloads",   "D", "chrome://mozapps/content/downloads/downloads.xul"],
-        viewPreferences: ["Preferences", "P", "about:config"]
-    }
 }, {
 }, {
     commands: function (dactyl, modules, window) {
diff --git a/teledactyl/config.json b/teledactyl/config.json
new file mode 100644
index 00000000..59825b60
--- /dev/null
+++ b/teledactyl/config.json
@@ -0,0 +1,71 @@
+{
+    "name": "teledactyl",
+    "appName": "Teledactyl",
+    "idName": "TELEDACTYL",
+    "host": "Thunderbird",
+    "hostbin": "thunderbird",
+
+    "autocommands": {
+        "DOMLoad": "Triggered when a page's DOM content has fully loaded",
+        "FolderLoad": "Triggered after switching folders in Thunderbird",
+        "PageLoadPre": "Triggered after a page load is initiated",
+        "PageLoad": "Triggered when a page gets (re)loaded/opened",
+        "Enter": "Triggered after Thunderbird starts",
+        "Leave": "Triggered before exiting Thunderbird",
+        "LeavePre": "Triggered before exiting Thunderbird"
+    },
+
+    "guioptions": {
+        "m": ["MenuBar", ["mail-toolbar-menubar2"]],
+        "T": ["Toolbar", ["mail-bar2"]]
+    },
+
+    "option-defaults": {
+        "complete": "f",
+        "showtabline": 1,
+        "titlestring": "Teledactyl"
+    },
+
+    "overlays": {
+        "chrome://messenger/content/messenger.xul": {
+            "features": [
+                "hints",
+                "mail",
+                "marks",
+                "addressbook",
+                "tabs"
+            ],
+
+            "guioptions": {
+                "f": ["Folder list",        ["folderPaneBox", "folderpane_splitter"]],
+                "F": ["Folder list header", ["folderPaneHeader"]]
+            },
+
+            "option-defaults": {
+                "guioptions": "bCfrs"
+            },
+
+            "scripts": [
+                "addressbook",
+                "mail",
+                "tabs"
+            ]
+        },
+
+        "chrome://messenger/content/messengercompose/messengercompose.xul": {
+            "is-compose-window": true,
+
+            "features": [
+                "addressbook"
+            ],
+
+            "option-defaults": {
+                "guioptions": "bCrs"
+            },
+
+            "scripts": [
+                "compose/compose"
+            ]
+        }
+    }
+}
diff --git a/teledactyl/content/config.js b/teledactyl/content/config.js
index fe80540a..0fae1d29 100644
--- a/teledactyl/content/config.js
+++ b/teledactyl/content/config.js
@@ -5,12 +5,6 @@
 "use strict";
 
 var Config = Module("config", ConfigBase, {
-    name: "teledactyl",
-    appName: "Teledactyl",
-    idName: "TELEDACTYL",
-    host: "Thunderbird",
-    hostbin: "thunderbird",
-
     Local: function Local(dactyl, modules, window)
         let ({ config } = modules, { document } = window) {
         init: function init() {
@@ -27,8 +21,6 @@ var Config = Module("config", ConfigBase, {
                 tabmail && tabmail.tabInfo.length ? tabmail.getBrowserForSelectedTab()
                                                   : document.getElementById("messagepane"),
 
-        get commandContainer() document.documentElement.id,
-
         tabbrowser: {
             __proto__: Class.makeClosure.call(window.document.getElementById("tabmail")),
             get mTabContainer() this.tabContainer,
@@ -47,16 +39,12 @@ var Config = Module("config", ConfigBase, {
             }
         },
 
-        get hasTabbrowser() !this.isComposeWindow,
-
         get tabStip() this.tabbrowser.tabContainer,
 
-        get isComposeWindow() window.wintype == "msgcompose",
-
         get mainWidget() this.isComposeWindow ? document.getElementById("content-frame") : window.GetThreadTree(),
 
-        get mainWindowId() this.isComposeWindow ? "msgcomposeWindow" : "messengerWindow",
         get browserModes() [modules.modes.MESSAGE],
+
         get mailModes() [modules.modes.NORMAL],
 
         // NOTE: as I don't use TB I have no idea how robust this is. --djk
@@ -115,8 +103,13 @@ var Config = Module("config", ConfigBase, {
         focusChange: function focusChange(win) {
             const { modes } = modules;
 
+            if (win.top == window)
+                return;
+
             // we switch to -- MESSAGE -- mode for Teledactyl when the main HTML widget gets focus
-            if (win && win.document instanceof Ci.nsIHTMLDocument || dactyl.focus instanceof Ci.nsIHTMLAnchorElement) {
+            if (win && win.document instanceof Ci.nsIDOMHTMLDocument
+                    || dactyl.focusedElement instanceof Ci.nsIDOMHTMLAnchorElement) {
+
                 if (this.isComposeWindow)
                     modes.set(modes.INSERT, modes.TEXT_EDIT);
                 else if (dactyl.mode != modes.MESSAGE)
@@ -125,54 +118,6 @@ var Config = Module("config", ConfigBase, {
         }
     },
 
-    autocommands: {
-        DOMLoad: "Triggered when a page's DOM content has fully loaded",
-        FolderLoad: "Triggered after switching folders in Thunderbird",
-        PageLoadPre: "Triggered after a page load is initiated",
-        PageLoad: "Triggered when a page gets (re)loaded/opened",
-        Enter: "Triggered after Thunderbird starts",
-        Leave: "Triggered before exiting Thunderbird",
-        LeavePre: "Triggered before exiting Thunderbird"
-    },
-
-    defaults: {
-        guioptions: "bCfrs",
-        complete: "f",
-        showtabline: 1,
-        titlestring: "Teledactyl"
-    },
-
-    /*** optional options, there are checked for existence and a fallback provided  ***/
-    features: Class.Memoize(function () Set(
-        this.isComposeWindow ? ["addressbook"]
-                             : ["hints", "mail", "marks", "addressbook", "tabs"])),
-
-    guioptions: {
-        m: ["MenuBar",            ["mail-toolbar-menubar2"]],
-        T: ["Toolbar" ,           ["mail-bar2"]],
-        f: ["Folder list",        ["folderPaneBox", "folderpane_splitter"]],
-        F: ["Folder list header", ["folderPaneHeader"]]
-    },
-
-    // they are sorted by relevance, not alphabetically
-    helpFiles: ["intro.html", "version.html"],
-
-    modes: [
-        ["MESSAGE", { char: "m" }],
-        ["COMPOSE"]
-    ],
-
-    get scripts() this.isComposeWindow ? ["compose/compose"] : [
-        "addressbook",
-        "mail",
-        "tabs",
-    ],
-
-    overlayChrome: ["chrome://messenger/content/messenger.xul",
-                      "chrome://messenger/content/messengercompose/messengercompose.xul"],
-    styleableChrome: ["chrome://messenger/content/messenger.xul",
-                      "chrome://messenger/content/messengercompose/messengercompose.xul"],
-
     // to allow Vim to :set ft=mail automatically
     tempFile: "teledactyl.eml"
 }, {
diff --git a/teledactyl/content/mail.js b/teledactyl/content/mail.js
index 3b67b450..cdfe22d4 100644
--- a/teledactyl/content/mail.js
+++ b/teledactyl/content/mail.js
@@ -179,9 +179,7 @@ var Mail = Module("mail", {
 
         params.type = Ci.nsIMsgCompType.New;
 
-        const msgComposeService = Cc["@mozilla.org/messengercompose;1"].getService();
-        msgComposeService = msgComposeService.QueryInterface(Ci.nsIMsgComposeService);
-        msgComposeService.OpenComposeWindowWithParams(null, params);
+        services.compose.OpenComposeWindowWithParams(null, params);
     },
 
     // returns an array of nsIMsgFolder objects
@@ -861,8 +859,8 @@ var Mail = Module("mail", {
     },
     services: function initServices(dactyl, modules, window) {
         services.add("smtp", "@mozilla.org/messengercompose/smtp;1", Ci.nsISmtpService);
+        services.add("compose", "@mozilla.org/messengercompose;1", "nsIMsgComposeService");
     },
-
     modes: function initModes(dactyl, modules, window) {
         modes.addMode("MESSAGE", {
             char: "m",