thanks Rated 1 out of 5 stars
i'm using Fx14 on Win7 ultimate
it works now
i think it had a conflict with some other add on, as i had many of them with same functionality, i removed others and now its ok.
or may be the windows high contrast theme was the problem, Firefox has some prob when i use high contrast theme, even without this add-on i was not able to switch background colors and also many of Facebook thumbnails in albums were disabled (blackened)
I am using Firefox 14.0.1 on Linux and it works fine.
Please send me an email at EliteBadger@gmail.com and let me know exactly what you're running and what's not working, and I'll see if I can help.