diff --git a/common/content/autocommands.js b/common/content/autocommands.js
index 5ce1ab49..e2eef7f9 100644
--- a/common/content/autocommands.js
+++ b/common/content/autocommands.js
@@ -12,6 +12,8 @@ const AutoCommand = new Struct("event", "pattern", "command");
  * @instance autocommands
  */
 const AutoCommands = Module("autocommands", {
+    requires: ["config"],
+
     init: function () {
         this._store = [];
     },
diff --git a/common/content/bookmarks.js b/common/content/bookmarks.js
index 452d384d..230decd4 100644
--- a/common/content/bookmarks.js
+++ b/common/content/bookmarks.js
@@ -8,7 +8,7 @@ const DEFAULT_FAVICON = "chrome://mozapps/skin/places/defaultFavicon.png";
 
 // also includes methods for dealing with keywords and search engines
 const Bookmarks = Module("bookmarks", {
-    requires: ["autocommands", "liberator", "storage", "services"],
+    requires: ["autocommands", "config", "liberator", "storage", "services"],
 
     init: function () {
         const faviconService   = services.get("favicon");
diff --git a/common/content/buffer.js b/common/content/buffer.js
index c08a42e1..4ae9d804 100644
--- a/common/content/buffer.js
+++ b/common/content/buffer.js
@@ -15,6 +15,8 @@ const Point = new Struct("x", "y");
  * @instance buffer
  */
 const Buffer = Module("buffer", {
+    requires: ["config"],
+
     init: function () {
 
         this.pageInfo = {};
diff --git a/common/content/commandline.js b/common/content/commandline.js
index 6a66f63d..f8d89139 100644
--- a/common/content/commandline.js
+++ b/common/content/commandline.js
@@ -12,7 +12,7 @@
  * this class when the chrome is ready.
  */
 const CommandLine = Module("commandline", {
-    requires: ["liberator", "modes", "services", "storage", "template", "util"],
+    requires: ["config", "liberator", "modes", "services", "storage", "template", "util"],
 
     init: function () {
         const self = this;
diff --git a/common/content/commands.js b/common/content/commands.js
index 9b4cdd34..ac598fca 100644
--- a/common/content/commands.js
+++ b/common/content/commands.js
@@ -33,6 +33,8 @@
  * @private
  */
 const Command = Class("Command", {
+    requires: ["config"],
+
     init: function (specs, description, action, extraInfo) {
         specs = Array.concat(specs);
 
diff --git a/common/content/configbase.js b/common/content/configbase.js
index 51a59608..cc19deaf 100644
--- a/common/content/configbase.js
+++ b/common/content/configbase.js
@@ -3,8 +3,7 @@
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
 
-
-const configbase = { //{{{
+const ConfigBase = Class(ModuleBase, {
     /**
      * @property {[["string", "string"]]} A sequence of names and descriptions
      *     of the autocommands available in this application. Primarily used
@@ -99,6 +98,6 @@ const configbase = { //{{{
      */
     get tempFile() this.name.toLowerCase() + ".tmp"
 
-}; //}}}
+});
 
 // vim: set fdm=marker sw=4 ts=4 et:
diff --git a/common/content/editor.js b/common/content/editor.js
index 2755d8ea..a1b62f80 100644
--- a/common/content/editor.js
+++ b/common/content/editor.js
@@ -11,6 +11,8 @@
 
 /** @instance editor */
 const Editor = Module("editor", {
+    requires: ["config"],
+
     init: function () {
         // store our last search with f, F, t or T
         //
diff --git a/common/content/events.js b/common/content/events.js
index 8dcfc550..e8debadb 100644
--- a/common/content/events.js
+++ b/common/content/events.js
@@ -10,7 +10,7 @@
  * @instance events
  */
 const Events = Module("events", {
-    requires: ["autocommands"],
+    requires: ["autocommands", "config"],
 
     init: function () {
         const self = this;
diff --git a/common/content/finder.js b/common/content/finder.js
index 33334036..53a432e4 100644
--- a/common/content/finder.js
+++ b/common/content/finder.js
@@ -20,6 +20,8 @@
  * @instance finder
  */
 const Finder = Module("finder", {
+    requires: ["config"],
+
     init: function () {
         const self = this;
 
diff --git a/common/content/hints.js b/common/content/hints.js
index a0fd440c..52452f4d 100644
--- a/common/content/hints.js
+++ b/common/content/hints.js
@@ -8,6 +8,8 @@
 /** @instance hints */
 const ELEM = 0, TEXT = 1, SPAN = 2, IMG_SPAN = 3;
 const Hints = Module("hints", {
+    requires: ["config"],
+
     init: function () {
 
         this._hintMode;
diff --git a/common/content/history.js b/common/content/history.js
index c9427958..b285a7d4 100644
--- a/common/content/history.js
+++ b/common/content/history.js
@@ -4,6 +4,8 @@
 // given in the LICENSE.txt file included with this file.
 
 const History = Module("history", {
+    requires: ["config"],
+
     get format() bookmarks.format,
 
     get service() services.get("history"),
diff --git a/common/content/io.js b/common/content/io.js
index ed5f7143..5537af4d 100644
--- a/common/content/io.js
+++ b/common/content/io.js
@@ -267,7 +267,7 @@ const File = Class("File", {
  * @instance io
  */
 const IO = Module("io", {
-    requires: ["services"],
+    requires: ["config", "services"],
 
     init: function () {
         this._processDir = services.get("directory").get("CurWorkD", Ci.nsIFile);
diff --git a/common/content/liberator-overlay.js b/common/content/liberator-overlay.js
index b2a310b4..e974b2e8 100644
--- a/common/content/liberator-overlay.js
+++ b/common/content/liberator-overlay.js
@@ -37,8 +37,8 @@
      "commandline.js",
      "commands.js",
      "completion.js",
-     "config.js",
      "configbase.js",
+     "config.js",
      "liberator.js",
      "editor.js",
      "events.js",
@@ -55,10 +55,9 @@
      "template.js",
      "util.js",
      ].forEach(load);
-    modules.config.__proto__ = modules.configbase;
 
-    prefix.unshift("chrome://" + modules.config.name.toLowerCase() + "/content/");
-    modules.config.scripts.forEach(load);
+    prefix.unshift("chrome://" + modules.Config.prototype.name.toLowerCase() + "/content/");
+    modules.Config.prototype.scripts.forEach(load);
 
 })();
 
diff --git a/common/content/liberator.js b/common/content/liberator.js
index ee717f28..e9cd7fe9 100644
--- a/common/content/liberator.js
+++ b/common/content/liberator.js
@@ -38,7 +38,7 @@ const FailedAssertion = Class("FailedAssertion", Error, {
 });
 
 const Liberator = Module("liberator", {
-    requires: ["services"],
+    requires: ["config", "services"],
 
     init: function () {
         window.liberator = this;
diff --git a/common/content/marks.js b/common/content/marks.js
index 7213d8dd..ff9b1523 100644
--- a/common/content/marks.js
+++ b/common/content/marks.js
@@ -8,7 +8,7 @@
  * @instance marks
  */
 const Marks = Module("marks", {
-    requires: ["storage"],
+    requires: ["config", "storage"],
 
     init: function init() {
         this._localMarks = storage.newMap("local-marks", { store: true, privateData: true });
diff --git a/common/content/modes.js b/common/content/modes.js
index c47ea658..3de622f1 100644
--- a/common/content/modes.js
+++ b/common/content/modes.js
@@ -6,7 +6,7 @@
 /** @scope modules */
 
 const Modes = Module("modes", {
-    requires: ["util"],
+    requires: ["config", "util"],
 
     init: function () {
         this._main = 1;     // NORMAL
diff --git a/common/content/modules.js b/common/content/modules.js
index 7e1a0b1b..c7501c52 100644
--- a/common/content/modules.js
+++ b/common/content/modules.js
@@ -1,7 +1,10 @@
 
 const ModuleBase = Class("ModuleBase", { requires: [] });
 function Module(name, inst, clas, moduleInit) {
-    const module = Class(name, ModuleBase, inst, clas);
+    var base = ModuleBase;
+    if (callable(inst))
+        base = Array.splice(arguments, 1, 1)[0]
+    const module = Class(name, base, inst, clas);
     module.INIT = moduleInit || {};
     module.requires = inst.requires || [];
     Module.list.push(module);
@@ -12,7 +15,7 @@ Module.list = [];
 Module.constructors = {};
 
 window.addEventListener("load", function () {
-    function dump(str) window.dump(String.replace(str, /\n?$/, "\n").replace(/^/m, config.name.toLowerCase() + ": "));
+    function dump(str) window.dump(String.replace(str, /\n?$/, "\n").replace(/^/m, Config.prototype.name.toLowerCase() + ": "));
     const start = Date.now();
     const deferredInit = { load: [] };
     const seen = set();
diff --git a/common/content/options.js b/common/content/options.js
index 32e63ee4..4af8899b 100644
--- a/common/content/options.js
+++ b/common/content/options.js
@@ -401,7 +401,7 @@ const Option = Class("Option", {
  * @instance options
  */
 const Options = Module("options", {
-    requires: ["highlight", "storage"],
+    requires: ["config", "highlight", "storage"],
 
     init: function () {
         for (let [, pref] in Iterator(this.allPrefs(Options.OLD_SAVED))) {
diff --git a/common/content/quickmarks.js b/common/content/quickmarks.js
index ed0a8e4c..31ec693a 100644
--- a/common/content/quickmarks.js
+++ b/common/content/quickmarks.js
@@ -9,7 +9,7 @@
 * @instance quickmarks
 */
 const QuickMarks = Module("quickmarks", {
-    requires: ["storage"],
+    requires: ["config", "storage"],
 
     init: function () {
         this._qmarks = storage.newMap("quickmarks", { store: true });
diff --git a/common/content/style.js b/common/content/style.js
index d6374a15..ba6ee58f 100644
--- a/common/content/style.js
+++ b/common/content/style.js
@@ -557,7 +557,7 @@ function Styles(name, store) {
 }
 
 Module("styles", {
-    requires: ["liberator", "storage", "util"],
+    requires: ["config", "liberator", "storage", "util"],
 
     init: function () {
         let (array = util.Array) {
@@ -707,7 +707,7 @@ Module("styles", {
 });
 
 Module("highlight", {
-    requires: ["styles"],
+    requires: ["config", "styles"],
 
     init: function () {
         const self = storage.newObject("highlight", Highlights, { store: false });
diff --git a/common/content/tabs.js b/common/content/tabs.js
index 5e37959f..d8a349a5 100644
--- a/common/content/tabs.js
+++ b/common/content/tabs.js
@@ -12,6 +12,8 @@
  * @instance tabs
  */
 const Tabs = Module("tabs", {
+    requires: ["config"],
+
     init: function () {
         this._alternates = [getBrowser().mCurrentTab, null];
 
diff --git a/muttator/content/config.js b/muttator/content/config.js
index ff31088f..557aa581 100644
--- a/muttator/content/config.js
+++ b/muttator/content/config.js
@@ -3,7 +3,12 @@
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
 
-const config = { //{{{
+const config = Module("config", ConfigBase, {
+    init: function () {
+        // don't wait too long when selecting new messages
+        // GetThreadTree()._selectDelay = 300; // TODO: make configurable
+    },
+
     /*** required options, no checks done if they really exist, so be careful ***/
     name: "Muttator",
     hostApplication: "Thunderbird", // TODO: can this be found out otherwise? gBrandBundle.getString("brandShortName");
@@ -146,20 +151,21 @@ const config = { //{{{
     get scripts() this.isComposeWindow() ? ["compose/compose.js"] : [
         "addressbook.js",
         "mail.js",
+        "tabs.js",
     ],
 
     // to allow Vim to :set ft=mail automatically
     tempFile: "mutt-ator-mail",
 
-    init: function () {
-        // don't wait too long when selecting new messages
-        // GetThreadTree()._selectDelay = 300; // TODO: make configurable
-
+}, {
+}, {
+    commands: function () {
         commands.add(["pref[erences]", "prefs"],
             "Show " + config.hostApplication + " preferences",
             function () { window.openOptionsDialog(); },
             { argCount: "0" });
-
+    },
+    optons: function () {
         // FIXME: comment obviously incorrect
         // 0: never automatically edit externally
         // 1: automatically edit externally when message window is shown the first time
@@ -179,9 +185,7 @@ const config = { //{{{
                 },
                 getter: function () MailOfflineMgr.isOnline()
             });
-
-        //}}}
-    }
-}; //}}}
+    },
+})
 
 // vim: set fdm=marker sw=4 ts=4 et:
diff --git a/muttator/content/mail.js b/muttator/content/mail.js
index 416b95d4..c6a6d84f 100644
--- a/muttator/content/mail.js
+++ b/muttator/content/mail.js
@@ -479,7 +479,7 @@ const Mail = Module("mail", {
                 bang: true,
             });
     },
-    completions: function () {
+    completion: function () {
         completion.mailFolder = function mailFolder(context) {
             let folders = mail.getFolders(context.filter);
             context.anchored = false;
diff --git a/vimperator/content/config.js b/vimperator/content/config.js
index 10a3046f..21fe014d 100644
--- a/vimperator/content/config.js
+++ b/vimperator/content/config.js
@@ -3,8 +3,10 @@
 // This work is licensed for reuse under an MIT license. Details are
 // given in the LICENSE.txt file included with this file.
 
+const Config = Module("config", ConfigBase, {
+    init: function () {
+    },
 
-const config = { //{{{
     /*** required options, no checks done if they really exist, so be careful ***/
     name: "Vimperator",
     hostApplication: "Firefox",
@@ -97,15 +99,7 @@ const config = { //{{{
 
     hasTabbrowser: true,
 
-    get ignoreKeys() {
-        delete this.ignoreKeys;
-        return this.ignoreKeys = {
-            "<Return>": modes.NORMAL | modes.INSERT,
-            "<Space>": modes.NORMAL | modes.INSERT,
-            "<Up>": modes.NORMAL | modes.INSERT,
-            "<Down>": modes.NORMAL | modes.INSERT
-        };
-    },
+    ignoreKeys: {},
 
     scripts: [
         "browser.js",
@@ -126,8 +120,9 @@ const config = { //{{{
 
         return prefix + ".tmp";
     },
-
-    init: function () {
+}, {
+}, {
+    commands: function () {
         commands.add(["winon[ly]"],
             "Close all other windows",
             function () {
@@ -227,28 +222,8 @@ const config = { //{{{
                 literal: 0,
                 privateData: true
             });
-
-        /////////////////////////////////////////////////////////////////////////////}}}
-        ////////////////////// OPTIONS /////////////////////////////////////////////////
-        /////////////////////////////////////////////////////////////////////////////{{{
-
-        options.add(["online"],
-            "Set the 'work offline' option",
-            "boolean", true,
-            {
-                setter: function (value) {
-                    const ioService = services.get("io");
-                    if (ioService.offline == value)
-                        BrowserOffline.toggleOfflineStatus();
-                    return value;
-                },
-                getter: function () !services.get("io").offline
-            });
-
-        /////////////////////////////////////////////////////////////////////////////}}}
-        ////////////////////// COMPLETIONS /////////////////////////////////////////////
-        /////////////////////////////////////////////////////////////////////////////{{{
-
+    },
+    completion: function () {
         var searchRunning = false; // only until Firefox fixes https://bugzilla.mozilla.org/show_bug.cgi?id=510589
         completion.location = function location(context) {
             if (!services.get("autoCompleteSearch"))
@@ -292,9 +267,29 @@ const config = { //{{{
         completion.addUrlCompleter("l",
             "Firefox location bar entries (bookmarks and history sorted in an intelligent way)",
             completion.location);
-
-        //}}}
-    }
-}; //}}}
+    },
+    modes: function () {
+        this.ignoreKeys = {
+            "<Return>": modes.NORMAL | modes.INSERT,
+            "<Space>": modes.NORMAL | modes.INSERT,
+            "<Up>": modes.NORMAL | modes.INSERT,
+            "<Down>": modes.NORMAL | modes.INSERT
+        };
+    },
+    options: function () {
+        options.add(["online"],
+            "Set the 'work offline' option",
+            "boolean", true,
+            {
+                setter: function (value) {
+                    const ioService = services.get("io");
+                    if (ioService.offline == value)
+                        BrowserOffline.toggleOfflineStatus();
+                    return value;
+                },
+                getter: function () !services.get("io").offline
+            });
+    },
+});
 
 // vim: set fdm=marker sw=4 ts=4 et:
diff --git a/xulmus/content/config.js b/xulmus/content/config.js
index c743ab93..2733e8b3 100644
--- a/xulmus/content/config.js
+++ b/xulmus/content/config.js
@@ -6,7 +6,18 @@
 
 Components.utils.import("resource://gre/modules/utils.js"); // XXX
 
-const config = { //{{{
+const config = Module("config", {
+    init: function () {
+        // TODO: mention this to SB devs, they seem keen to provide these
+        // functions to make porting from FF as simple as possible.
+        window.toJavaScriptConsole = function () {
+            toOpenWindowByType("global:console", "chrome://global/content/console.xul");
+        };
+
+        window.BrowserStop = function () {
+            SBGetBrowser().mCurrentBrowser.stop();
+        };
+    },
     /*** required options, no checks done if they really exist, so be careful ***/
     name: "Xulmus",
     hostApplication: "Songbird",
@@ -158,98 +169,69 @@ const config = { //{{{
     stop: function (tab) {
         SBGetBrowser().mCurrentBrowser.stop();
     },
+}, {
 
-    init: function () {
-        // Adding a mode for Player
-        //modes.addMode("PLAYER"); // Player mode for songbird
+    // TODO: support 'nrformats'? -> probably not worth it --mst
+    incrementURL: function (count) {
+        let matches = buffer.URL.match(/(.*?)(\d+)(\D*)$/);
+        if (!matches)
+            return void liberator.beep();
 
-        // TODO: support 'nrformats'? -> probably not worth it --mst
-        function incrementURL(count) {
-            let matches = buffer.URL.match(/(.*?)(\d+)(\D*)$/);
-            if (!matches)
-                return void liberator.beep();
-
-            let [, pre, number, post] = matches;
-            let newNumber = parseInt(number, 10) + count;
-            let newNumberStr = String(newNumber > 0 ? newNumber : 0);
-            if (number.match(/^0/)) { // add 0009<C-a> should become 0010
-                while (newNumberStr.length < number.length)
-                    newNumberStr = "0" + newNumberStr;
-            }
-
-            liberator.open(pre + newNumberStr + post);
+        let [, pre, number, post] = matches;
+        let newNumber = parseInt(number, 10) + count;
+        let newNumberStr = String(newNumber > 0 ? newNumber : 0);
+        if (number.match(/^0/)) { // add 0009<C-a> should become 0010
+            while (newNumberStr.length < number.length)
+                newNumberStr = "0" + newNumberStr;
         }
 
-        function showServicePane(value) {
-            const key = "splitter.servicepane_splitter.was_collapsed";
-            gServicePane.open = value;
-            SBDataSetBoolValue(key, gServicePane.open);
+        liberator.open(pre + newNumberStr + post);
+    },
+
+    showServicePane: function (value) {
+        const key = "splitter.servicepane_splitter.was_collapsed";
+        gServicePane.open = value;
+        SBDataSetBoolValue(key, gServicePane.open);
+    },
+
+    openDisplayPane: function (id) {
+        if (id == "servicepane")
+            this.showServicePane(true);
+        else {
+            let pane = document.getElementById(id);
+            let manager = Cc['@songbirdnest.com/Songbird/DisplayPane/Manager;1'].getService(Ci.sbIDisplayPaneManager);
+            let paneinfo = manager.getPaneInfo(pane._lastURL.stringValue);
+
+            if (!paneinfo)
+                paneinfo = manager.defaultPaneInfo;
+
+            pane.loadContent(paneinfo);
         }
+    },
 
-        function openDisplayPane(id) {
-            if (id == "servicepane")
-                showServicePane(true);
-            else {
-                let pane = document.getElementById(id);
-                let manager = Cc['@songbirdnest.com/Songbird/DisplayPane/Manager;1'].getService(Ci.sbIDisplayPaneManager);
-                let paneinfo = manager.getPaneInfo(pane._lastURL.stringValue);
-
-                if (!paneinfo)
-                    paneinfo = manager.defaultPaneInfo;
-
-                pane.loadContent(paneinfo);
-            }
-        }
-
-        function closeDisplayPane(id) {
-            if (id == "servicepane")
-                showServicePane(false);
-            else
-                document.getElementById(id).hide();
-        }
-
-        // FIXME: best way to format these args? Hyphenated? One word like :dialog?
-        let displayPanes = {
-            "service pane left": "servicepane",
-            "content pane bottom": "displaypane_contentpane_bottom",
-            "service pane bottom": "displaypane_servicepane_bottom",
-            "right sidebar": "displaypane_right_sidebar"
-        };
-
-        completion.displayPane = function (context) {
-            context.title = ["Display Pane"];
-            context.completions = displayPanes; // FIXME: useful description etc
-        };
-
-        ////////////////////////////////////////////////////////////////////////////////
-        ////////////////////// STYLES //////////////////////////////////////////////////
-        /////////////////////////////////////////////////////////////////////////////{{{
-
-        let img = Image();
-        img.src = "chrome://xulmus/content/logo.png";
-        img.onload = function () {
-            styles.addSheet(true, "logo", "chrome://liberator/locale/*",
-                ".xulmus-logo {" + <>
-                     display:    inline-block;
-                     background: url({img.src});
-                     width:      {img.width}px;
-                     height:     {img.height}px;
-                </> + "}",
-                true);
-            delete img;
-        };
-
-        /////////////////////////////////////////////////////////////////////////////}}}
-        ////////////////////// COMMANDS ////////////////////////////////////////////////
-        /////////////////////////////////////////////////////////////////////////////{{{
+    closeDisplayPane: function (id) {
+        if (id == "servicepane")
+            this.showServicePane(false);
+        else
+            document.getElementById(id).hide();
+    },
 
+    // FIXME: best way to format these args? Hyphenated? One word like :dialog?
+    displayPanes: {
+        "service pane left": "servicepane",
+        "content pane bottom": "displaypane_contentpane_bottom",
+        "service pane bottom": "displaypane_servicepane_bottom",
+        "right sidebar": "displaypane_right_sidebar"
+    }
+}, {
+    commands: function () {
         commands.add(["dpcl[ose]"],
             "Close a display pane",
             function (args) {
                 let arg = args.literalArg;
 
-                if (arg in displayPanes)
-                    closeDisplayPane(displayPanes[arg]);
+                if (arg in Config.displayPanes)
+                    Config.closeDisplayPane(Config.displayPanes[arg]);
                 else
                     liberator.echoerr("E475: Invalid argument: " + arg);
 
@@ -266,8 +248,8 @@ const config = { //{{{
             function (args) {
                 let arg = args.literalArg;
 
-                if (arg in displayPanes)
-                    openDisplayPane(displayPanes[arg]);
+                if (arg in Config.displayPanes)
+                    Config.openDisplayPane(Config.displayPanes[arg]);
                     // TODO: focus when we have better key handling of these extended modes
                 else
                     liberator.echoerr("E475: Invalid argument: " + arg);
@@ -293,11 +275,14 @@ const config = { //{{{
                 argCount: "0",
                 bang: true
             });
-
-        /////////////////////////////////////////////////////////////////////////////}}}
-        ////////////////////// OPTIONS /////////////////////////////////////////////////
-        /////////////////////////////////////////////////////////////////////////////{{{
-
+    },
+    completion: function () {
+        completion.displayPane = function (context) {
+            context.title = ["Display Pane"];
+            context.completions = Config.displayPanes; // FIXME: useful description etc
+        };
+    },
+    options: function () {
         // TODO: SB doesn't explicitly support an offline mode. Should we? --djk
         options.add(["online"],
             "Set the 'work offline' option",
@@ -311,23 +296,7 @@ const config = { //{{{
                 },
                 getter: function () !services.get("io").offline
             });
-
-        /////////////////////////////////////////////////////////////////////////////}}}
-        ////////////////////// COMPLETIONS /////////////////////////////////////////////
-        /////////////////////////////////////////////////////////////////////////////{{{
-
-        //}}}
-
-        // TODO: mention this to SB devs, they seem keen to provide these
-        // functions to make porting from FF as simple as possible.
-        window.toJavaScriptConsole = function () {
-            toOpenWindowByType("global:console", "chrome://global/content/console.xul");
-        };
-
-        window.BrowserStop = function () {
-            SBGetBrowser().mCurrentBrowser.stop();
-        };
     }
-}; //}}}
+});
 
 // vim: set fdm=marker sw=4 ts=4 et:
diff --git a/xulmus/content/player.js b/xulmus/content/player.js
index f3ccdb7f..a896884e 100644
--- a/xulmus/content/player.js
+++ b/xulmus/content/player.js
@@ -560,7 +560,7 @@ const Player = Module("player", {
             },
             { argCount: "1" });
     },
-    completions: function () {
+    completion: function () {
         completion.song = function song(context, args) {
             // TODO: useful descriptions?
             function map(list) list.map(function (i) [i, ""]);