Comment 2 for bug 787807

Just to clarify, Firefox is designated as my Web Browser in System > Preferences > Prefered Applications. Secondly, in Firefox's about:config, the parameter "browser.tabs.loadDivertedInBackground" is already set to false. Also, I have run Firefox in safe mode and I have uninstalled/reinstalled Firefox to a fresh blank profile but in all cases external links do not change the focus to Firefox. However, if I set the browser to Chromium in Preferences > Preferred Applications then external links do change focus to Chromium.

I have done quite a bit of testing with new users created in empty home directories. I found that this problem does not exist for new users that I create on my computer if the user is running Unity. That is, if I create a new user on my system then the external links do properly change focus to Firefox for the new user when running Unity. The problem occurs only when I am running Ubuntu Classic (not running Unity). That is, when I create a brand new user in an empty directory then external links do not focus properly on Firefox if I am not running Unity (Ubuntu). Whereas, when I am running Unity (Ubuntu Classic) then external links do focus properly on Firefox.