diff --git a/common/bootstrap.js b/common/bootstrap.js
index a09e50ec..cc27630c 100755
--- a/common/bootstrap.js
+++ b/common/bootstrap.js
@@ -61,6 +61,10 @@ function startup(data, reason) {
         addon = data;
         AddonManager.getAddonByID(addon.id, function (a) { addon = a; });
 
+        // Temporary hack.
+        if (basePath.isDirectory() && JSMLoader.bump == null)
+            JSMLoader.bump = 1;
+
         if (basePath.isDirectory())
             getURI = function getURI(path) {
                 let file = basePath.clone().QueryInterface(Ci.nsILocalFile);
diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 94045c14..870d07b7 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -934,7 +934,7 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
      * @param {number} level The logging level 0 - 15.
      */
     log: function (msg, level) {
-        let verbose = prefs.get("extensions.dactyl.loglevel", 0);
+        let verbose = localPrefs.get("loglevel", 0);
 
         if (!level || level <= verbose) {
             if (isObject(msg))
diff --git a/common/modules/base.jsm b/common/modules/base.jsm
index e4439df7..39e8b126 100644
--- a/common/modules/base.jsm
+++ b/common/modules/base.jsm
@@ -334,9 +334,10 @@ function deprecated(reason, fn) {
     function deprecatedMethod() {
         let frame = Components.stack.caller;
         let obj = this.className || this.constructor.className;
-        if (!set.add(deprecatedMethod.seen, frame.filename))
+        let filename = frame.filename.replace(/.* -> /, "");
+        if (!set.add(deprecatedMethod.seen, filename))
             util.dactyl(fn).echoerr(
-                util.urlPath(frame.filename || "unknown") + ":" + frame.lineNumber + ": " +
+                util.urlPath(filename || "unknown") + ":" + frame.lineNumber + ": " +
                 (obj ? obj + "." : "") + (fn.name || name) + " is deprecated: " + reason);
         return func.apply(this, arguments);
     }
diff --git a/common/modules/prefs.jsm b/common/modules/prefs.jsm
index b4b9e0a9..4ade793c 100644
--- a/common/modules/prefs.jsm
+++ b/common/modules/prefs.jsm
@@ -8,7 +8,7 @@
 
 Components.utils.import("resource://dactyl/base.jsm");
 defineModule("prefs", {
-    exports: ["Prefs", "prefs"],
+    exports: ["Prefs", "localPrefs", "prefs"],
     require: ["services", "util"],
     use: ["config", "template"]
 });
@@ -16,20 +16,21 @@ defineModule("prefs", {
 var Prefs = Module("prefs", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]), {
     SAVED: "extensions.dactyl.saved.",
     RESTORE: "extensions.dactyl.restore.",
+    INIT: {},
 
-    init: function () {
+    init: function (branch) {
         this._prefContexts = [];
 
         util.addObserver(this);
-        this._branch = services.pref.getBranch("").QueryInterface(Ci.nsIPrefBranch2);
-        this._branch.addObserver("", this, false);
+        this.branch = services.pref.getBranch(branch || "").QueryInterface(Ci.nsIPrefBranch2);
+        this.branch.addObserver("", this, false);
         this._observers = {};
 
         this.restore();
     },
 
     cleanup: function cleanup() {
-        this._branch.removeObserver("", this);
+        this.branch.removeObserver("", this);
     },
 
     observe: {
@@ -123,7 +124,7 @@ var Prefs = Module("prefs", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
      * @param {string} branch The branch in which to search preferences.
      *     @default ""
      */
-    getNames: function (branch) services.pref.getChildList(branch || "", { value: 0 }),
+    getNames: function (branch) this.branch.getChildList(branch || "", { value: 0 }),
 
     _checkSafe: function (name, message, value) {
         let curval = this._load(name, null, false);
@@ -208,7 +209,7 @@ var Prefs = Module("prefs", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
      */
     reset: function (name) {
         try {
-            services.pref.clearUserPref(name);
+            this.branch.clearUserPref(name);
         }
         catch (e) {} // ignore - thrown if not a user set value
     },
@@ -219,7 +220,7 @@ var Prefs = Module("prefs", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
      * @param {string} name The preference name.
      */
     toggle: function (name) {
-        util.assert(services.pref.getPrefType(name) === Ci.nsIPrefBranch.PREF_BOOL,
+        util.assert(this.branch.getPrefType(name) === Ci.nsIPrefBranch.PREF_BOOL,
                     "E488: Trailing characters: " + name + "!");
         this.set(name, !this.get(name));
     },
@@ -276,24 +277,24 @@ var Prefs = Module("prefs", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
                                 ? "E521: Number required after =: " + name + "=" + value
                                 : "E474: Invalid argument: " + name + "=" + value);
 
-        let type = services.pref.getPrefType(name);
+        let type = this.branch.getPrefType(name);
         switch (typeof value) {
         case "string":
             assertType(Ci.nsIPrefBranch.PREF_STRING);
 
             let supportString = Cc["@mozilla.org/supports-string;1"].createInstance(Ci.nsISupportsString);
             supportString.data = value;
-            services.pref.setComplexValue(name, Ci.nsISupportsString, supportString);
+            this.branch.setComplexValue(name, Ci.nsISupportsString, supportString);
             break;
         case "number":
             assertType(Ci.nsIPrefBranch.PREF_INT);
 
-            services.pref.setIntPref(name, value);
+            this.branch.setIntPref(name, value);
             break;
         case "boolean":
             assertType(Ci.nsIPrefBranch.PREF_BOOL);
 
-            services.pref.setBoolPref(name, value);
+            this.branch.setBoolPref(name, value);
             break;
         default:
             throw FailedAssertion("Unknown preference type: " + typeof value + " (" + name + "=" + value + ")");
@@ -304,14 +305,14 @@ var Prefs = Module("prefs", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
         if (defaultValue == null)
             defaultValue = null;
 
-        let branch = defaultBranch ? services.pref.getDefaultBranch("") : services.pref;
-        let type = services.pref.getPrefType(name);
+        let branch = defaultBranch ? services.pref.getDefaultBranch(this.branch.root) : this.branch;
+        let type = this.branch.getPrefType(name);
         try {
             switch (type) {
             case Ci.nsIPrefBranch.PREF_STRING:
                 let value = branch.getComplexValue(name, Ci.nsISupportsString).data;
                 // try in case it's a localized string (will throw an exception if not)
-                if (!services.pref.prefIsLocked(name) && !services.pref.prefHasUserValue(name) &&
+                if (!this.branch.prefIsLocked(name) && !this.branch.prefHasUserValue(name) &&
                     RegExp("chrome://.+/locale/.+\\.properties").test(value))
                         value = branch.getComplexValue(name, Ci.nsIPrefLocalizedString).data;
                 return value;
@@ -339,10 +340,13 @@ var Prefs = Module("prefs", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
     },
     javascript: function (dactyl, modules) {
         modules.JavaScript.setCompleter([this.get, this.safeSet, this.set, this.reset, this.toggle],
-                [function (context) (context.anchored=false, prefs.getNames().map(function (pref) [pref, ""]))]);
+                [function (context) (context.anchored=false, this.getNames().map(function (pref) [pref, ""]))]);
     }
 });
 
+var localPrefs = Prefs("extensions.dactyl.");
+defineModule.modules.push(localPrefs);
+
 endModule();
 
 // catch(e){dump(e.fileName+":"+e.lineNumber+": "+e+"\n" + e.stack);}
diff --git a/common/modules/sanitizer.jsm b/common/modules/sanitizer.jsm
index 6cc7ffe8..08d5fa27 100644
--- a/common/modules/sanitizer.jsm
+++ b/common/modules/sanitizer.jsm
@@ -52,7 +52,7 @@ var Item = Class("Item", {
     shouldSanitize: function (shutdown) (!shutdown || this.builtin || this.persistent) &&
         prefs.get(shutdown ? this.shutdownPref : this.pref)
 }, {
-    PREFIX: "extensions.dactyl.",
+    PREFIX: localPrefs.branch.root,
     BRANCH: "privacy.cpd.",
     SHUTDOWN_BRANCH: "privacy.clearOnShutdown."
 });
@@ -261,8 +261,8 @@ var Sanitizer = Module("sanitizer", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakRef
         }
     },
 
-    get ranAtShutdown()    prefs.get(Item.PREFIX + "didSanitizeOnShutdown"),
-    set ranAtShutdown(val) prefs.set(Item.PREFIX + "didSanitizeOnShutdown", Boolean(val)),
+    get ranAtShutdown()    localPrefs.get("didSanitizeOnShutdown"),
+    set ranAtShutdown(val) localPrefs.set("didSanitizeOnShutdown", Boolean(val)),
     get runAtShutdown()    prefs.get("privacy.sanitize.sanitizeOnShutdown"),
     set runAtShutdown(val) prefs.set("privacy.sanitize.sanitizeOnShutdown", Boolean(val)),