Some sites (Youtube, Comcast, etc., think I'm using an old version of Firefox, but I have the latest version.

Some sites such as Youtube, Comcast, and others give me a warning that I am not using a compatible browser and suggest installing Firefox (among others).
Even this page that I am typing on now thinks I have Firefox 2.0.0.14!
However, I have Firefox 3.6.12 installed and seemingly working fine. I've even tried re-installing the latest version of Firefox over my current installation (I don't want to uninstall first, as I am afraid of losing my Bookmarks), but to no avail.
Can anybody tell me what's wrong? Thanks very much!

See:
* [[Web sites or add-ons incorrectly report incompatible browser]]
* http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default
Check the <b>general.useragent</b> prefs on the <b>about:config</b> page.<br />
You can open the <i>about:config</i> page via the location bar, just like you open a website.<br />
Filter: <b>general.useragent</b><br />
If any <i>general.useragent</i> prefs are bold (user set) then right-click that pref and choose <i>Reset</i>.

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