I too have had problems with FF. I always have tabs open, one problem was when runescape was open and running if I went to a different tab and try'd to type things it would not turn out correctly. Sometimes firefox became not responding. I tried download sun java but I think it did a bad install :P so Instead to resolve the problem I went to the "downloads" option on the runescape home page and downloaded the runescape browser, Since then I've had no problems todo with either things. Btw, firefox is the best!
