I use the latest version, but it won't let me install Adblock Plus because he thinks I'm using Firefox 2.0. YouTube also thinks I'm using an older version.

I tried to update to Firefox several times, and I completely uninstalled and then installed again.

You have a corrupted user agent:
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; RV:1.9.2.8) Gecko/20100722 Firefox/2.0.0.11 (.NET CLR 3.5.30729)

See find which version of Firefox you are using and Web sites or modules incorrectly report incompatible browser

See also http://kb.mozillazine.org/Resetting_your_useragent_string_to_its_compiled-in_default

Check general.useragent preferences on the topic: config page.

You can open the topic: config page through the address bar just like you open a Web site.

Filter: general.useragent

If all general.useragent prefs are "BOLD" (user set) then right-click this pref and select reset.

Tags: Firefox

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