Bug 612036 - "Error during resize if focused element has a custom dragger" [r=mark.finkle]

mobile/chrome/content/browser.js

@@ -292,7 +292,7 @@ var Browser = {
       // We want to keep the current focused element into view if possible
       let currentElement = document.activeElement;
       let [scrollbox, scrollInterface] = ScrollUtils.getScrollboxFromElement(currentElement);
-      if (currentElement && (currentElement.id != "inputhandler-overlay") && scrollbox && currentElement != scrollbox) {
+      if (scrollbox && scrollInterface && currentElement && currentElement != scrollbox) {
         // retrieve the direct child of the scrollbox
         while (currentElement.parentNode != scrollbox)
           currentElement = currentElement.parentNode;