I've just pushed https://github.com/mdn/webextensions-examples/commit/f98638396bcba2fe9f0a934a1ad6da00d45157d9 for this. _Originalmente postado por @wbamberg em https://github.com/mdn/webextensions-examples/issues/29#issuecomment-173020956_
I've just pushed mdn/webextensions-examples@f986383 for this.
Originalmente postado por @wbamberg em mdn/webextensions-examples#29 (comment)