diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 474f533b..db778156 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -853,7 +853,7 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
      * @param {number} level The logging level 0 - 15.
      */
     log: function (msg, level) {
-        let verbose = localPrefs.get("loglevel", 0);
+        let verbose = config.prefs.get("loglevel", 0);
 
         if (!level || level <= verbose) {
             if (isObject(msg) && !isinstance(msg, _))
@@ -1110,10 +1110,12 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
     /**
      * Restart the host application.
      */
-    restart: function () {
+    restart: function (args) {
         if (!this.confirmQuit())
             return;
 
+        config.prefs.set("commandline-args", args);
+
         services.appStartup.quit(Ci.nsIAppStartup.eAttemptQuit | Ci.nsIAppStartup.eRestart);
     },
 
@@ -1579,6 +1581,35 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
                 bang: true
             });
 
+        let startupOptions = [
+            {
+                names: ["+u"],
+                description: "The initialization file to execute at startup",
+                type: CommandOption.STRING
+            },
+            {
+                names: ["++noplugin"],
+                description: "Do not automatically load plugins"
+            },
+            {
+                names: ["++cmd"],
+                description: "Ex commands to execute prior to initialization",
+                type: CommandOption.STRING,
+                multiple: true
+            },
+            {
+                names: ["+c"],
+                description: "Ex commands to execute after initialization",
+                type: CommandOption.STRING,
+                multiple: true
+            },
+            {
+                names: ["+purgecaches"],
+                description: "Purge " + config.appName + " caches at startup",
+                type: CommandOption.NOARG
+            }
+        ];
+
         commands.add(["reh[ash]"],
             "Reload the " + config.appName + " add-on",
             function (args) {
@@ -1589,35 +1620,16 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
             },
             {
                 argCount: "0", // FIXME
-                options: [
-                    {
-                        names: ["+u"],
-                        description: "The initialization file to execute at startup",
-                        type: CommandOption.STRING
-                    },
-                    {
-                        names: ["++noplugin"],
-                        description: "Do not automatically load plugins"
-                    },
-                    {
-                        names: ["++cmd"],
-                        description: "Ex commands to execute prior to initialization",
-                        type: CommandOption.STRING,
-                        multiple: true
-                    },
-                    {
-                        names: ["+c"],
-                        description: "Ex commands to execute after initialization",
-                        type: CommandOption.STRING,
-                        multiple: true
-                    }
-                ]
+                options: startupOptions
             });
 
         commands.add(["res[tart]"],
             "Force " + config.host + " to restart",
-            function () { dactyl.restart(); },
-            { argCount: "0" });
+            function (args) { dactyl.restart(args.string); },
+            {
+                argCount: "0",
+                options: startupOptions
+            });
 
         function findToolbar(name) DOM.XPath(
             "//*[@toolbarname=" + util.escapeString(name, "'") + " or " +
@@ -1821,7 +1833,12 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
 
         dactyl.timeout(function () {
             try {
-                var args = storage.session.commandlineArgs || services.commandLineHandler.optionValue;
+                var args = config.prefs.get("commandline-args")
+                        || storage.session.commandlineArgs
+                        || services.commandLineHandler.optionValue;
+
+                config.prefs.reset("commandline-args");
+
                 if (isString(args))
                     args = dactyl.parseCommandLine(args);
 
@@ -1839,9 +1856,9 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
 
             dactyl.log(_("dactyl.commandlineOpts", util.objectToString(dactyl.commandLineOptions)), 3);
 
-            if (localPrefs.get("first-run", true))
+            if (config.prefs.get("first-run", true))
                 dactyl.timeout(function () {
-                    localPrefs.set("first-run", false);
+                    config.prefs.set("first-run", false);
                     this.withSavedValues(["forceTarget"], function () {
                         this.forceTarget = dactyl.NEW_TAB;
                         help.help();
diff --git a/common/locale/en-US/starting.xml b/common/locale/en-US/starting.xml
index 39e1c40e..0a9ce2b3 100644
--- a/common/locale/en-US/starting.xml
+++ b/common/locale/en-US/starting.xml
@@ -76,6 +76,18 @@
     </description>
 </item>
 
+<item>
+    <tags>+purgecaches</tags>
+    <strut/>
+    <spec>+purgecaches</spec>
+    <description>
+        <p>
+            Purges &dactyl.appName; caches at startup. May occasionally be
+            necessary after making local changes to the source tree.
+        </p>
+    </description>
+</item>
+
 <h2 tag="initialization startup">Initialization</h2>
 
 <p>At startup, &dactyl.appName; completes the following tasks in order. </p>
@@ -182,10 +194,12 @@
             repository, this is a good way to update to the latest version or
             to test your changes.
         </p>
+
         <p>
             Any arguments supplied are parsed as command-line arguments as
             specified in <t>startup-options</t>.
         </p>
+
         <warning>
             Not all plugins are designed to cleanly un-apply during a rehash.
             While official plugins are safe, beware of possible instability
@@ -196,9 +210,14 @@
 
 <item>
     <tags>:res :restart</tags>
-    <spec>:res<oa>tart</oa></spec>
+    <spec>:res<oa>tart</oa> <oa>arg</oa> …</spec>
     <description short="true">
         <p>Force &dactyl.host; to restart. Useful when installing extensions.</p>
+
+        <p>
+            Any arguments supplied are parsed as command-line arguments as
+            specified in <t>startup-options</t>.
+        </p>
     </description>
 </item>
 
diff --git a/common/modules/config.jsm b/common/modules/config.jsm
index 20c70987..094b7bdd 100644
--- a/common/modules/config.jsm
+++ b/common/modules/config.jsm
@@ -17,6 +17,7 @@ this.lazyRequire("addons", ["AddonManager"]);
 this.lazyRequire("cache", ["cache"]);
 this.lazyRequire("highlight", ["highlight"]);
 this.lazyRequire("messages", ["_"]);
+this.lazyRequire("prefs", ["localPrefs", "prefs"]);
 
 function AboutHandler() {}
 AboutHandler.prototype = {
@@ -66,6 +67,8 @@ var ConfigBase = Class("ConfigBase", {
         });
     },
 
+    get prefs() localPrefs,
+
     get has() Set.has(this.features),
 
     configFiles: [
diff --git a/common/modules/help.jsm b/common/modules/help.jsm
index 1326c565..31e2ec0d 100644
--- a/common/modules/help.jsm
+++ b/common/modules/help.jsm
@@ -57,7 +57,7 @@ var HelpBuilder = Class("HelpBuilder", {
         let result = [];
         for (let base in values(this.bases)) {
             let url = [base, file, ".xml"].join("");
-            let res = util.httpGet(url);
+            let res = util.httpGet(url, { quiet: true });
             if (res) {
                 if (res.responseXML.documentElement.localName == "document")
                     this.files[file] = url;
diff --git a/common/modules/options.jsm b/common/modules/options.jsm
index a2a71c3a..a1a0dbf7 100644
--- a/common/modules/options.jsm
+++ b/common/modules/options.jsm
@@ -14,6 +14,8 @@ defineModule("options", {
     require: ["contexts", "messages", "storage"]
 }, this);
 
+this.lazyRequire("config", ["config"]);
+
 /** @scope modules */
 
 let ValueError = Class("ValueError", ErrorBase);
@@ -947,7 +949,7 @@ var Options = Module("options", {
     setPref: deprecated("prefs.set", function setPref() prefs.set.apply(prefs, arguments)),
     withContext: deprecated("prefs.withContext", function withContext() prefs.withContext.apply(prefs, arguments)),
 
-    cleanupPrefs: Class.Memoize(function () localPrefs.Branch("cleanup.option.")),
+    cleanupPrefs: Class.Memoize(function () config.prefs.Branch("cleanup.option.")),
 
     cleanup: function cleanup(reason) {
         if (~["disable", "uninstall"].indexOf(reason))
diff --git a/common/modules/sanitizer.jsm b/common/modules/sanitizer.jsm
index e0c9f998..ba18674f 100644
--- a/common/modules/sanitizer.jsm
+++ b/common/modules/sanitizer.jsm
@@ -55,7 +55,7 @@ var Item = Class("SanitizeItem", {
     shouldSanitize: function (shutdown) (!shutdown || this.builtin || this.persistent) &&
         prefs.get(shutdown ? this.shutdownPref : this.pref)
 }, {
-    PREFIX: localPrefs.branch.root,
+    PREFIX: config.prefs.branch.root,
     BRANCH: "privacy.cpd.",
     SHUTDOWN_BRANCH: "privacy.clearOnShutdown."
 });
@@ -290,8 +290,8 @@ var Sanitizer = Module("sanitizer", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakRef
         }
     },
 
-    get ranAtShutdown()    localPrefs.get("didSanitizeOnShutdown"),
-    set ranAtShutdown(val) localPrefs.set("didSanitizeOnShutdown", Boolean(val)),
+    get ranAtShutdown()    config.prefs.get("didSanitizeOnShutdown"),
+    set ranAtShutdown(val) config.prefs.set("didSanitizeOnShutdown", Boolean(val)),
     get runAtShutdown()    prefs.get("privacy.sanitize.sanitizeOnShutdown"),
     set runAtShutdown(val) prefs.set("privacy.sanitize.sanitizeOnShutdown", Boolean(val)),
 
diff --git a/common/modules/util.jsm b/common/modules/util.jsm
index 30d466d6..1e21f3fc 100644
--- a/common/modules/util.jsm
+++ b/common/modules/util.jsm
@@ -739,7 +739,8 @@ var Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
             return xmlhttp;
         }
         catch (e) {
-            util.dactyl.log(_("error.cantOpen", String.quote(url), e), 1);
+            if (!params.quiet)
+                util.dactyl.log(_("error.cantOpen", String.quote(url), e), 1);
             return null;
         }
     },
@@ -1183,7 +1184,7 @@ var Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
     rehash: function (args) {
         storage.session.commandlineArgs = args;
         this.timeout(function () {
-            cache.flushAll();
+            this.flushCache();
             this.rehashing = true;
             let addon = config.addon;
             addon.userDisabled = true;