Comment 1 for bug 1273399

@robert; Could you confirm any error messages in the background page please?

1) Open 'chrome://extensions'
2) Enable Developer mode (top right)
3) Click on the (now visible) background-page.html link
4) Select console tab

5) Go back to browser page
6) enter reddit.com or facebook.com in the url
7) Return to background-page and note any messages.

Thanks.