Firefox 3.5 compatible

Finally the add-on got reviewed by the people @mozilla.org and the new version will now be available for everyone who's upgraded to Firefox 3.5!

I am the first to admit that my add-on does not get updated very often. I haven't added any new features in years. None the less people use this cute little tool every day. The statistics below show just how much the add-on is used every day. I was not aware of this and it makes me think that maybe I should put a little more effort into listening to what you guys out there want improved. Hopefully I will be able to add the most requested feature of having the option to select different languages from the right-click meny.