diff --git a/common/content/dactyl.js b/common/content/dactyl.js
index 529e74bd..aea35ab7 100644
--- a/common/content/dactyl.js
+++ b/common/content/dactyl.js
@@ -1007,7 +1007,7 @@ var Dactyl = Module("dactyl", XPCOM(Ci.nsISupportsWeakReference, ModuleBase), {
                     // Try to find a matching file.
                     let file = io.File(url);
                     if (file.exists() && file.isReadable())
-                        return services.io.newFileURI(file).spec;
+                        return file.URI.spec;
                 }
                 catch (e) {}
             }
diff --git a/common/modules/buffer.jsm b/common/modules/buffer.jsm
index 6b790974..ff0711a4 100644
--- a/common/modules/buffer.jsm
+++ b/common/modules/buffer.jsm
@@ -638,6 +638,7 @@ var Buffer = Module("Buffer", {
                              | persist.PERSIST_FLAGS_REPLACE_EXISTING_FILES;
 
         let window = this.topWindow;
+        file = File(file);
         if (!file.exists())
             file.create(Ci.nsIFile.NORMAL_FILE_TYPE, octal(666));
 
@@ -649,7 +650,7 @@ var Buffer = Module("Buffer", {
             persist.progressListener = update(Object.create(downloadListener), {
                 onStateChange: util.wrapCallback(function onStateChange(progress, request, flags, status) {
                     if (callback && (flags & Ci.nsIWebProgressListener.STATE_STOP) && status == 0)
-                        util.trapErrors(callback, self, uri, file, progress, request, flags, status);
+                        util.trapErrors(callback, self, uri, file.file, progress, request, flags, status);
 
                     return onStateChange.superapply(this, arguments);
                 })
@@ -657,7 +658,7 @@ var Buffer = Module("Buffer", {
         else
             persist.progressListener = downloadListener;
 
-        persist.saveURI(uri, null, null, null, null, file);
+        persist.saveURI(uri, null, null, null, null, file.path);
     },
 
     /**
diff --git a/common/modules/cache.jsm b/common/modules/cache.jsm
index 719611d5..4a075170 100644
--- a/common/modules/cache.jsm
+++ b/common/modules/cache.jsm
@@ -79,7 +79,7 @@ var Cache = Module("Cache", XPCOM(Ci.nsIRequestObserver), {
         if (!this._cacheReader && this.cacheFile.exists()
                 && !this.inQueue)
             try {
-                this._cacheReader = services.ZipReader(this.cacheFile);
+                this._cacheReader = services.ZipReader(this.cacheFile.file);
             }
             catch (e if e.result == Cr.NS_ERROR_FILE_CORRUPTED) {
                 util.reportError(e);
@@ -99,14 +99,14 @@ var Cache = Module("Cache", XPCOM(Ci.nsIRequestObserver), {
                 if (!this.cacheFile.exists())
                     mode |= File.MODE_CREATE;
 
-                cache._cacheWriter = services.ZipWriter(this.cacheFile, mode);
+                cache._cacheWriter = services.ZipWriter(this.cacheFile.file, mode);
             }
             catch (e if e.result == Cr.NS_ERROR_FILE_CORRUPTED) {
                 util.reportError(e);
                 this.cacheFile.remove(false);
 
                 mode |= File.MODE_CREATE;
-                cache._cacheWriter = services.ZipWriter(this.cacheFile, mode);
+                cache._cacheWriter = services.ZipWriter(this.cacheFile.file, mode);
             }
         return this._cacheWriter;
     },
@@ -159,7 +159,7 @@ var Cache = Module("Cache", XPCOM(Ci.nsIRequestObserver), {
     },
 
     flushJAR: function flushJAR(file) {
-        services.observer.notifyObservers(file, "flush-cache-entry", "");
+        services.observer.notifyObservers(File(file).file, "flush-cache-entry", "");
     },
 
     flushStartup: function flushStartup() {
diff --git a/common/modules/config.jsm b/common/modules/config.jsm
index 4373acab..ba255bda 100644
--- a/common/modules/config.jsm
+++ b/common/modules/config.jsm
@@ -260,7 +260,7 @@ var ConfigBase = Class("ConfigBase", {
             }
         }
         function processJar(file) {
-            let jar = services.ZipReader(file);
+            let jar = services.ZipReader(file.file);
             if (jar)
                 try {
                     if (jar.hasEntry("chrome.manifest"))
diff --git a/common/modules/contexts.jsm b/common/modules/contexts.jsm
index f25c1916..beb471b0 100644
--- a/common/modules/contexts.jsm
+++ b/common/modules/contexts.jsm
@@ -377,7 +377,7 @@ var Contexts = Module("contexts", {
            return {
                 __proto__: frame,
                 filename: this.context.file[0] == "[" ? this.context.file
-                                                      : services.io.newFileURI(File(this.context.file)).spec,
+                                                      : File(this.context.file).URI.spec,
                 lineNumber: this.context.line
             };
         return frame;
diff --git a/common/modules/dom.jsm b/common/modules/dom.jsm
index 76858dc1..d23932c9 100644
--- a/common/modules/dom.jsm
+++ b/common/modules/dom.jsm
@@ -1562,7 +1562,7 @@ var DOM = Class("DOM", {
         function tag(args, namespaces) {
             let _namespaces = namespaces;
 
-            if (isinstance(args, ["String", "Number", _]))
+            if (isinstance(args, ["String", "Number", "Boolean", _]))
                 return doc.createTextNode(args);
             if (isXML(args))
                 return DOM.fromXML(args, doc, nodes);
diff --git a/common/modules/downloads.jsm b/common/modules/downloads.jsm
index 5d12d8bd..84b593f1 100644
--- a/common/modules/downloads.jsm
+++ b/common/modules/downloads.jsm
@@ -105,7 +105,7 @@ var Download = Class("Download", {
             function action() {
                 try {
                     if (this.MIMEInfo && this.MIMEInfo.preferredAction == this.MIMEInfo.useHelperApp)
-                        this.MIMEInfo.launchWithFile(file);
+                        this.MIMEInfo.launchWithFile(file.file);
                     else
                         file.launch();
                 }
diff --git a/common/modules/help.jsm b/common/modules/help.jsm
index 28dbd1ac..647ef6f0 100644
--- a/common/modules/help.jsm
+++ b/common/modules/help.jsm
@@ -298,7 +298,7 @@ var Help = Module("Help", {
                 var addURIEntry  = function addURIEntry(file, uri) addDataEntry(file, util.httpGet(uri).responseText);
             }
             else {
-                var zip = services.ZipWriter(FILE, File.MODE_CREATE | File.MODE_WRONLY | File.MODE_TRUNCATE);
+                var zip = services.ZipWriter(FILE.file, File.MODE_CREATE | File.MODE_WRONLY | File.MODE_TRUNCATE);
 
                 addURIEntry = function addURIEntry(file, uri)
                     zip.addEntryChannel(PATH + file, TIME, 9,
diff --git a/common/modules/io.jsm b/common/modules/io.jsm
index da0ddf05..b64ee70e 100644
--- a/common/modules/io.jsm
+++ b/common/modules/io.jsm
@@ -361,7 +361,7 @@ var IO = Module("io", {
         file = util.getFile(file);
         if (file && file.exists() && file.isFile() && file.isReadable()) {
             // let jar = services.zipReader.getZip(file); Crashes.
-            let jar = services.ZipReader(file);
+            let jar = services.ZipReader(file.file);
             try {
                 let filter = RegExp("^" + util.regexp.escape(decodeURI(path))
                                     + "[^/]*/?$");
@@ -444,7 +444,7 @@ var IO = Module("io", {
             return -1;
         }
 
-        let process = services.Process(file);
+        let process = services.Process(file.file);
         process.run(false, args.map(String), args.length);
         try {
             if (callable(blocking))
@@ -668,9 +668,7 @@ var IO = Module("io", {
 
                 // require bang if any of the paths exist
                 for (let [type, item] in iter(rtItems)) {
-                    let file = io.File(rtDir);
-                    file.append(type);
-                    file.append(config.name + ".vim");
+                    let file = io.File(rtDir).child(type, config.name + ".vim");
                     dactyl.assert(!file.exists() || args.bang, _("io.exists", file.path.quote()));
                     item.file = file;
                 }
diff --git a/common/modules/services.jsm b/common/modules/services.jsm
index 065e7c63..734f6694 100644
--- a/common/modules/services.jsm
+++ b/common/modules/services.jsm
@@ -113,7 +113,7 @@ var Services = Module("Services", {
     },
     reinit: function () {},
 
-    _create: function (name, args) {
+    _create: function _create(name, args) {
         try {
             var service = this.services[name];
 
@@ -130,7 +130,10 @@ var Services = Module("Services", {
             }
             return res;
         }
-        catch (e if service.quiet !== false) {
+        catch (e) {
+            if (service.quiet === false)
+                throw e.stack ? e : Error(e);
+
             if (typeof util !== "undefined")
                 util.reportError(e);
             else
@@ -149,7 +152,7 @@ var Services = Module("Services", {
      * @param {string} meth The name of the function used to instantiate
      *     the service.
      */
-    add: function (name, class_, ifaces, meth) {
+    add: function add(name, class_, ifaces, meth) {
         const self = this;
         this.services[name] = { method: meth, class: class_, interfaces: Array.concat(ifaces || []) };
         if (name in this && ifaces && !this.__lookupGetter__(name) && !(this[name] instanceof Ci.nsISupports))
@@ -167,14 +170,14 @@ var Services = Module("Services", {
      * @param {string} init Name of a property or method used to initialize the
      *     class.
      */
-    addClass: function (name, class_, ifaces, init, quiet) {
+    addClass: function addClass(name, class_, ifaces, init, quiet) {
         const self = this;
         this.services[name] = { class: class_, interfaces: Array.concat(ifaces || []), method: "createInstance", init: init, quiet: quiet };
         if (init)
             memoize(this.services[name], "callable",
                     function () callable(XPCOMShim(this.interfaces)[this.init]));
 
-        this[name] = function () self._create(name, arguments);
+        this[name] = function Create() self._create(name, arguments);
         update.apply(null, [this[name]].concat([Ci[i] for each (i in Array.concat(ifaces))]));
         return this[name];
     },
@@ -198,7 +201,7 @@ var Services = Module("Services", {
      *
      * @param {string} name The service's cache key.
      */
-    has: function (name) Set.has(this.services, name) && this.services[name].class in Cc &&
+    has: function has(name) Set.has(this.services, name) && this.services[name].class in Cc &&
         this.services[name].interfaces.every(function (iface) iface in Ci)
 });
 
diff --git a/common/modules/storage.jsm b/common/modules/storage.jsm
index 20706767..abac085a 100644
--- a/common/modules/storage.jsm
+++ b/common/modules/storage.jsm
@@ -179,7 +179,7 @@ var ObjectStore = Class("ObjectStore", StoreBase, {
 var Storage = Module("Storage", {
     alwaysReload: {},
 
-    init: function () {
+    init: function init() {
         this.cleanup();
 
         let { Services } = Cu.import("resource://gre/modules/Services.jsm", {});
@@ -341,7 +341,7 @@ var File = Class("File", {
         if (path instanceof Ci.nsIFileURL)
             path = path.file;
 
-        if (path instanceof Ci.nsIFile)
+        if (path instanceof Ci.nsIFile || path instanceof File)
             file = path.clone();
         else if (/file:\/\//.test(path))
             file = services["file:"].getFileFromURLSpec(path);
@@ -359,11 +359,8 @@ var File = Class("File", {
                 return File.DoesNotExist(path, e);
             }
         }
-        this.file = file;
-
-        let self = XPCSafeJSObjectWrapper(file.QueryInterface(Ci.nsILocalFile));
-        self.__proto__ = this;
-        return self;
+        this.file = file.QueryInterface(Ci.nsILocalFile);
+        return this;
     },
 
     charset: Class.Memoize(function () File.defaultEncoding),
@@ -372,7 +369,8 @@ var File = Class("File", {
      * @property {nsIFileURL} Returns the nsIFileURL object for this file.
      */
     URI: Class.Memoize(function () {
-        let uri = services.io.newFileURI(this).QueryInterface(Ci.nsIFileURL);
+        let uri = services.io.newFileURI(this.file)
+                          .QueryInterface(Ci.nsIFileURL);
         uri.QueryInterface(Ci.nsIMutable).mutable = false;
         return uri;
     }),
@@ -380,7 +378,7 @@ var File = Class("File", {
     /**
      * Iterates over the objects in this directory.
      */
-    iterDirectory: function () {
+    iterDirectory: function iterDirectory() {
         if (!this.exists())
             throw Error(_("io.noSuchFile"));
         if (!this.isDirectory())
@@ -392,17 +390,18 @@ var File = Class("File", {
     /**
      * Returns a new file for the given child of this directory entry.
      */
-    child: function (name) {
+    child: function child() {
         let f = this.constructor(this);
-        for each (let elem in name.split(File.pathSplit))
-            f.append(elem);
+        for (let [, name] in Iterator(arguments))
+            for each (let elem in name.split(File.pathSplit))
+                f.append(elem);
         return f;
     },
 
     /**
      * Returns an iterator for all lines in a file.
      */
-    get lines() File.readLines(services.FileInStream(this, -1, 0, 0),
+    get lines() File.readLines(services.FileInStream(this.file, -1, 0, 0),
                                this.charset),
 
     /**
@@ -413,8 +412,8 @@ var File = Class("File", {
      *          @default #charset
      * @returns {string}
      */
-    read: function (encoding) {
-        let ifstream = services.FileInStream(this, -1, 0, 0);
+    read: function read(encoding) {
+        let ifstream = services.FileInStream(this.file, -1, 0, 0);
 
         return File.readStream(ifstream, encoding || this.charset);
     },
@@ -426,7 +425,7 @@ var File = Class("File", {
      *     entries.
      * @returns {[nsIFile]}
      */
-    readDirectory: function (sort) {
+    readDirectory: function readDirectory(sort) {
         if (!this.isDirectory())
             throw Error(_("io.eNotDir"));
 
@@ -441,7 +440,7 @@ var File = Class("File", {
      *
      * @returns {nsIFileURL}
      */
-    toURI: function toURI() services.io.newFileURI(this),
+    toURI: function toURI() services.io.newFileURI(this.file),
 
     /**
      * Writes the string *buf* to this file.
@@ -467,7 +466,7 @@ var File = Class("File", {
      * @param {string} encoding The encoding to used to write the file.
      * @default #charset
      */
-    write: function (buf, mode, perms, encoding) {
+    write: function write(buf, mode, perms, encoding) {
         function getStream(defaultChar) {
             return services.ConvOutStream(ofstream, encoding, 0, defaultChar);
         }
@@ -487,7 +486,7 @@ var File = Class("File", {
         if (!this.exists()) // OCREAT won't create the directory
             this.create(this.NORMAL_FILE_TYPE, perms);
 
-        let ofstream = services.FileOutStream(this, mode, perms, 0);
+        let ofstream = services.FileOutStream(this.file, mode, perms, 0);
         try {
             var ocstream = getStream(0);
             ocstream.writeString(buf);
@@ -506,7 +505,34 @@ var File = Class("File", {
             ofstream.close();
         }
         return true;
-    }
+    },
+
+    // Wrapped native methods:
+    copyTo: function copyTo(dir, name)
+        this.file.copyTo(this.constructor(dir).file,
+                         name),
+
+    copyToFollowingLinks: function copyToFollowingLinks(dir, name)
+        this.file.copyToFollowingLinks(this.constructor(dir).file,
+                                       name),
+
+    moveTo: function moveTo(dir, name)
+        this.file.moveTo(this.constructor(dir).file,
+                         name),
+
+    equals: function equals(file)
+        this.file.equals(this.constructor(file).file),
+
+    contains: function contains(dir, recur)
+        this.file.contains(this.constructor(dir).file,
+                           recur),
+
+    getRelativeDescriptor: function getRelativeDescriptor(file)
+        this.file.getRelativeDescriptor(this.constructor(file).file),
+
+    setRelativeDescriptor: function setRelativeDescriptor(file, path)
+        this.file.setRelativeDescriptor(this.constructor(file).file,
+                                        path)
 }, {
     /**
      * @property {number} Open for reading only.
@@ -697,6 +723,28 @@ var File = Class("File", {
     replacePathSep: function (path) path.replace("/", File.PATH_SEP, "g")
 });
 
+let (file = services.directory.get("ProfD", Ci.nsIFile)) {
+    Object.keys(file).forEach(function (prop) {
+        if (!(prop in File.prototype)) {
+            let isFunction;
+            try {
+                isFunction = callable(file[prop])
+            }
+            catch (e) {}
+
+            if (isFunction)
+                File.prototype[prop] = util.wrapCallback(function wrapper() this.file[prop].apply(this.file, arguments));
+            else
+                Object.defineProperty(File.prototype, prop, {
+                    configurable: true,
+                    get: function wrap_get() this.file[prop],
+                    set: function wrap_set(val) { this.file[prop] = val; }
+                });
+        }
+    });
+    file = null;
+}
+
 endModule();
 
 // catch(e){ dump(e + "\n" + (e.stack || Error().stack)); Components.utils.reportError(e) }
diff --git a/common/tests/functional/testCommands.js b/common/tests/functional/testCommands.js
index 0d7761de..2f986259 100644
--- a/common/tests/functional/testCommands.js
+++ b/common/tests/functional/testCommands.js
@@ -827,7 +827,6 @@ var tests = {
     time: {
         error: ["", ":some-nonexistent-command"/*, "some_nonexistent_reference"*/], // FIXME
         singleOutput: [":js null", "null"]
-
     },
     get tlistkeys() this.listcommands,
     tmap: {},
@@ -903,7 +902,7 @@ var tests = {
         error: ["foo"],
         multiOutput: [
             ["", function (msg) {
-                var res = /(\w+dactyl) (\S+) \(([\^)]+)\) running on:\nMozilla/;
+                var res = /(\w+dactyl) (\S+) \(([\^)]+)\) running on:\nMozilla/.exec(msg);
                 return res && res[2] != "null" && res[3] != "null";
             }]
         ]