keyplyr - 1:29 am on Feb 18, 2012 (gmt 0)
After reading the OP I decided to block FF/3.0* - I don't think that has been legit for a long time.
Wrong, FF/3.0* is used by thousands and thousands of Ubantu/Linux users. These are real people that buy things! FF/3.0* is the up-to-date for these OS.