I tried upgrading to firefox 4.x and was no longer able to log in to several forums. I've heard this problem exist for other members too. So I went back to 3.6 and it worked again. I like Firefox very much and want to keep my system up to date but I need to have access to the forums that I moderate. The unknown user agent message happens with all higher versions then 3.6. I hope this can be solved or that there is a proper workaround. Best regards, Paul