Awhile back a user in Go Firefox! had posted their Firefox had been modified by Babylon. The translation software had added a bunch of bloatware into Firefox including a toolbar as well as making itself the default home page and search engine. A couple of other users have reported this issue as well. I happened to be checking the Mozilla Support site and saw one of the Hot Topic is How to remove the Babylon toolbar, home page and search engine. This is a very good step-by-step article with lots of screenshots that will help you get rid of Babylon and its associated bloatware.