Add util.iterFrames.

common/modules/buffer.jsm

@@ -363,17 +363,13 @@ var Buffer = Module("Buffer", {
     /**
      * Returns a list of all frames in the given window or current buffer.
      */
-    allFrames: function allFrames(win, focusedFirst) {
-        let frames = [];
-        (function rec(frame) {
-            if (true || frame.document.body instanceof Ci.nsIDOMHTMLBodyElement)
-                frames.push(frame);
-            Array.forEach(frame.frames, rec);
-        })(win || this.win);
+    allFrames: function allFrames(win=this.win, focusedFirst) {
+        let frames = iter(util.iterFrames(win)).toArray();
 
         if (focusedFirst)
             return frames.filter(f => f === this.focusedFrame).concat(
                    frames.filter(f => f !== this.focusedFrame));
+
         return frames;
     },
 
@@ -2337,7 +2333,7 @@ var Buffer = Module("Buffer", {
                 if (count >= 1 || !elem || !events.isContentNode(elem)) {
                     let xpath = ["frame", "iframe", "input", "xul:textbox", "textarea[not(@disabled) and not(@readonly)]"];
 
-                    let frames = buffer.allFrames(null, true);
+                    let frames = buffer.allFrames(undefined, true);
 
                     let elements = Ary.flatten(frames.map(win => [m for (m of DOM.XPath(xpath, win.document))]))
                                       .filter(function (elem) {

common/modules/util.jsm

@@ -1704,6 +1704,19 @@ var Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
         }
     },
 
+    /**
+     * Iterates, depth-first, over the given window and all of its descendant
+     * frames.
+     *
+     * @param {nsIDOMWindow} win The root window.
+     * @returns {Generator(nsIDOMWindow)}
+     */
+    iterFrames: function* iterFrames(win) {
+            yield win;
+            for (let i = 0; i < win.frames.length; i++)
+                yield* iterFrames(win.frames[i]);
+    },
+
     /**
      * Returns a list of all domains and subdomains of documents in the
      * given window and all of its descendant frames.
@@ -1712,16 +1725,14 @@ var Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
      * @returns {[string]} The visible domains.
      */
     visibleHosts: function visibleHosts(win) {
-        let res = [],
-            seen = new RealSet;
-        (function rec(frame) {
+        let res = [], seen = new RealSet;
+        for (let frame of this.iterFrames(win)) {
             try {
                 if (frame.location.hostname)
                     res = res.concat(util.subdomains(frame.location.hostname));
             }
             catch (e) {}
-            Array.forEach(frame.frames, rec);
-        })(win);
+        }
         return res.filter(h => !seen.add(h));
     },
 
@@ -1733,15 +1744,13 @@ var Util = Module("Util", XPCOM([Ci.nsIObserver, Ci.nsISupportsWeakReference]),
      * @returns {[nsIURI]} The visible URIs.
      */
     visibleURIs: function visibleURIs(win) {
-        let res = [],
-            seen = new RealSet;
-        (function rec(frame) {
+        let res = [], seen = new RealSet;
+        for (let frame of this.iterFrames(win)) {
             try {
-                res = res.concat(util.newURI(frame.location.href));
+                res.push(util.newURI(frame.location.href));
             }
             catch (e) {}
-            Array.forEach(frame.frames, rec);
-        })(win);
+        }
         return res.filter(h => !seen.add(h.spec));
     },