--- a/mobile/chrome/content/browser-ui.js
+++ b/mobile/chrome/content/browser-ui.js
@@ -146,18 +146,19 @@ var BrowserUI = {
   },
 
   _linkAdded : function(aEvent) {
     let link = aEvent.originalTarget;
     if (!link || !link.href)
       return;
 
     if (/\bicon\b/i(link.rel)) {
+      // Must have an owner document and not be in a frame
       var ownerDoc = link.ownerDocument;
-      if (!ownerDoc) // no document, no icon
+      if (!ownerDoc || ownerDoc.defaultView.frameElement)
         return;
 
       let tab = Browser.getTabForDocument(ownerDoc);
       tab.setIcon(link.href);
       // If the link changes after pageloading, update it right away.
       // otherwise we wait until the pageload finishes
       if ((tab.browser == Browser.selectedBrowser) && !tab.isLoading())
         this._updateIcon(tab.browser.mIconURL);