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Unknown user agent at several forums when using other than firefox 3.6

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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

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That is going to have to be fixed in the forum software or users are going to need to install a user agent switcher addon to fake the user agent that Firefox is sending, but that may cause problems on other websites which are HTML5 compatible.