Use temp files rather than URL arguments for :viewsource!. Also update the statusline on :redraw and add an XPCOM shim class for pseudo-XPCOM objects.

common/modules/base.jsm

@@ -139,12 +139,11 @@ defineModule("base", {
     // sed -n 's/^(const|function) ([a-zA-Z0-9_]+).*/	"\2",/p' base.jsm | sort | fmt
     exports: [
         "Cc", "Ci", "Class", "Cr", "Cu", "Module", "Object", "Runnable",
-        "Struct", "StructBase", "Timer", "UTF8", "XPCOMUtils", "array",
+        "Struct", "StructBase", "Timer", "UTF8", "XPCOM", "XPCOMUtils", "array",
         "call", "callable", "curry", "debuggerProperties", "defineModule",
         "endModule", "forEach", "isArray", "isGenerator", "isinstance",
         "isObject", "isString", "isSubclass", "iter", "iterAll", "keys",
-        "memoize", "properties", "requiresMainThread", "set", "update",
-        "values"
+        "memoize", "properties", "requiresMainThread", "set", "update", "values"
     ],
     use: ["services"]
 });
@@ -700,6 +699,25 @@ Class.extend = function extend(subclass, superclass, overrides) {
         superclass.prototype.constructor = superclass;
 }
 
+/**
+ * A base class generator for classes which impliment XPCOM interfaces.
+ *
+ * @param {nsIIID|[nsIJSIID]} interfaces The interfaces which the class
+ *      implements.
+ * @param {Class} superClass A super class. @optional
+ * @returns {Class}
+ */
+function XPCOM(interfaces, superClass) {
+    interfaces = Array.concat(interfaces);
+    let shim = interfaces.reduce(function (shim, iface) shim.QueryInterface(iface),
+                                 Cc["@dactyl.googlecode.com/base/xpc-interface-shim"].createInstance());
+    let res = Class("XPCOM(" + interfaces + ")", superClass || Class, update(
+        array([k, v === undefined || callable(v) ? function stub() null : v] for ([k, v] in Iterator(shim))).toObject(),
+        { QueryInterface: XPCOMUtils.generateQI(interfaces) }));
+    shim = interfaces = null;
+    return res;
+}
+
 /**
  * Memoizes the value of a class property to the falue returned by
  * the passed function the first time the property is accessed.

common/modules/bookmarkcache.jsm

@@ -24,7 +24,7 @@ const history   = services.get("history");
 const tagging   = services.get("tagging");
 const name      = "bookmark-cache";
 
-const BookmarkCache = Module("BookmarkCache", {
+const BookmarkCache = Module("BookmarkCache", XPCOM(Ci.nsINavBookmarkObserver), {
     init: function init() {
         bookmarks.addObserver(this, false);
     },
@@ -116,11 +116,6 @@ const BookmarkCache = Module("BookmarkCache", {
         return bookmarks;
     },
 
-    onBeforeItemRemoved: function () {},
-    onBeginUpdateBatch:  function () {},
-    onEndUpdateBatch:    function () {},
-    onItemVisited:       function () {},
-    onItemMoved:         function () {},
     onItemAdded: function onItemAdded(itemId, folder, index) {
         if (bookmarks.getItemType(itemId) == bookmarks.TYPE_BOOKMARK) {
             if (this.isBookmark(itemId)) {
@@ -147,8 +142,7 @@ const BookmarkCache = Module("BookmarkCache", {
                 storage.fireEvent(name, "change", { __proto__: bookmark, changed: property });
             }
         }
-    },
-    QueryInterface: XPCOMUtils.generateQI([Ci.nsINavBookmarkObserver])
+    }
 }, {
     getFavicon: function getFavicon(uri) {
         try {

common/modules/sanitizer.jsm

@@ -29,7 +29,7 @@ Range.prototype.contains = function (date)
 Range.prototype.__defineGetter__("isEternity", function () this.max == null && this.min == null);
 Range.prototype.__defineGetter__("isSession", function () this.max == null && this.min == sanitizer.sessionStart);
 
-const Sanitizer = Module("sanitizer", tmp.Sanitizer, {
+const Sanitizer = Module("sanitizer", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference], tmp.Sanitizer), {
     sessionStart: Date.now() * 1000,
 
     init: function () {
@@ -90,8 +90,6 @@ const Sanitizer = Module("sanitizer", tmp.Sanitizer, {
         util.addObserver(this);
     },
 
-    QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
-
     addItem: function addItem(name, params) {
         if (params.description)
             this.itemDescriptions[name] = params.description;