Bug 834266 - Use XPCNativeWrapper to compare elements, r=mdas

testing/marionette/marionette-elements.js

@@ -97,8 +97,8 @@ ElementManager.prototype = {
     if (!el) {
       throw new ElementException("Element has not been seen before", 17, null);
     }
-    el = el;
+    // use XPCNativeWrapper to compare elements; see bug 834266
-    if (!(el.ownerDocument.isEqualNode(win.document))) {
+    if (!(XPCNativeWrapper(el).ownerDocument == XPCNativeWrapper(win).document)) {
       throw new ElementException("Stale element reference", 10, null);
     }
     return el;

testing/marionette/marionette-listener.js

@@ -1162,9 +1162,16 @@ function switchToFrame(msg) {
   }
   if (msg.json.element != undefined) {
     if (elementManager.seenItems[msg.json.element] != undefined) {
-      let wantedFrame = elementManager.getKnownElement(msg.json.element, curWindow); //HTMLIFrameElement
+      let wantedFrame;
+      try {
+        wantedFrame = elementManager.getKnownElement(msg.json.element, curWindow); //HTMLIFrameElement
+      }
+      catch(e) {
+        sendError(e.message, e.code, e.stack, command_id);
+      }
       for (let i = 0; i < frames.length; i++) {
-        if (frames[i].isEqualNode(wantedFrame)) {
+        // use XPCNativeWrapper to compare elements; see bug 834266
+        if (XPCNativeWrapper(frames[i]) == XPCNativeWrapper(wantedFrame)) {
           curWindow = frames[i]; 
           foundFrame = i;
         }