Update UI and catch executeScript errors now shown in Canary

go-back-with-backspace/manifest.json

 {
   "name": "__MSG_extensionName__",
   "description": "__MSG_extensionDescription__",
   "default_locale": "en",
   "version": "2.0",
   "manifest_version": 2,
   "minimum_chrome_version": "52",
   "icons": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
@@ skipping 17 matching lines @@
       "js": ["is_editable.js", "content_script.js"],
       "all_frames": true,
       "run_at": "document_start"
     }
   ],
   "options_ui": {
     "page": "pages/options.html",
     "chrome_style": true
   },
   "permissions": [
+    "activeTab",

[Pam (message me for reviews), 2016/10/07 23:12:43]

It turns out this is needed after all, to get the URL for the popup.

[Devlin, 2016/10/29 00:30:31]

Sorry, don't follow - why is this needed?  Which popup?

[Pam (message me for reviews), 2016/10/29 05:10:36]

The popup attached to the browser action, pages/popup.*. It needs the URL of the
current tab, for a button that adds/removes that URL to/from the blacklist. Even
with <all_urls>, the URL is blank unless activeTab permission is also present.

[Devlin, 2016/11/01 15:12:14]

That sounds like a bug to me.  If you have all urls, we shouldn't hide the url
(there's no point).  Can you file a new bug?

In the meantime, try using "tabs" here instead of activeTab - that should
definitely work.

     "management",
     "storage",
     "<all_urls>"
   ]
 }