Bug 1241719 - Fix intermittent browser_ext_tabs_onUpdated.js r=kmag

MozReview-Commit-ID: LhHS6F0YFUJ

--HG--
extra : rebase_source : b174f162c4a51868748420e39e1a7c85d789a96a

browser/components/extensions/test/browser/browser_ext_tabs_onUpdated.js

@@ -30,7 +30,11 @@ add_task(function* () {
       let collectedSequence = [];
 
       browser.tabs.onUpdated.addListener(function(tabId, updatedInfo) {
-        collectedSequence.push(updatedInfo);
+        // onUpdated also fires with updatedInfo.faviconUrl, so explicitly
+        // check for updatedInfo.status before recording the event.
+        if ("status" in updatedInfo) {
+          collectedSequence.push(updatedInfo);
+        }
       });
 
       browser.runtime.onMessage.addListener(function() {