You have or had an extension installed (NET_mmhpset) that has changed the user agent from Firefox/3.6.x to Firefox/3.0.x. You can see the Firefox version at the top and the user agent at bottom of the "Help > About" window (Mac: Firefox > About Mozilla Firefox). You check (compare) what websites see: http://whatsmyuseragent.com/ - Whats My User Agent? You can check the '''general.useragent''' prefs on the '''about:config''' page. You can open the ''about:config'' page via the location bar, just like you open a website. Filter: '''general.useragent''' If ''general.useragent'' prefs are bold (user set) then you can right-click that pref and choose ''Reset''. See [[Web sites or add-ons incorrectly report incompatible browser]] and [[Finding your Firefox version]] See also http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default