Update UI and catch executeScript errors now shown in Canary

go-back-with-backspace/manifest.json

Index: go-back-with-backspace/manifest.json
diff --git a/go-back-with-backspace/manifest.json b/go-back-with-backspace/manifest.json
index bd8308da115194fd9038a626a39cd49eb8383495..5726b8977902ee362fc85d0630078f026a128d45 100644
--- a/go-back-with-backspace/manifest.json
+++ b/go-back-with-backspace/manifest.json
@@ -35,6 +35,7 @@
     "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>"