Eventually got it to work!! Bewertet mit 4 von 5 Sternen

I couldn't manage to get this to work for some reason. I've installed it twice but the add on bar wasn't showing up so I didn't know what to do.
Then I noticed a tiny tick at the bottom right of the page, you need to hit that after you've scrolled down. Firefox will try to crash but as long as you leave it to do it's thing it should be ok.

Diese Bewertung wurde für eine vorherige Version des Add-ons (0.rev17) abgegeben. 

You'll have to turn on add-on bar view. You can refer this link:http://support.mozilla.org/en-US/kb/add-on-bar-quick-access-to-add-ons#w_how-do-i-show-or-hide-the-add-on-bar