Fix :tabdo.

common/modules/template.jsm

@@ -225,7 +225,7 @@ const Template = Module("Template", {
         let url = (frame.filename || "unknown").replace(/.* -> /, "");
         function getPath(url) {
             try {
-                return util.getFile(util.newURI(url)).path;
+                return util.getFile(url).path;
             }
             catch (e) {
                 return url;

common/modules/util.jsm

@@ -470,6 +470,9 @@ const Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference])
      * @param {nsIURI} uri The URI for which to find a file.
      */
     getFile: function getFile(uri) {
+        if (isString(uri))
+            uri = util.newURI(uri);
+
         if (uri instanceof Ci.nsIFileURL)
             return File(uri.QueryInterface(Ci.nsIFileURL).file);
         let channel = services.io.newChannelFromURI(uri);