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Firefox detects wrong version

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My firefox is version 3.6 but on the addon page it thinks my version is 3.0.5. When I go to the about page on my firefox at the top it says 3.6.12, but in the box below it says <<Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3) Gecko/20090824 Ant.com Toolbar 1.4 Firefox/3.0.5, Ant.com Toolbar 1.3 (.NET CLR 3.5.30729) >>

My firefox is version 3.6 but on the addon page it thinks my version is 3.0.5. When I go to the about page on my firefox at the top it says 3.6.12, but in the box below it says <<Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.3) Gecko/20090824 Ant.com Toolbar 1.4 Firefox/3.0.5, Ant.com Toolbar 1.3 (.NET CLR 3.5.30729) >>

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See * Web sites or add-ons incorrectly report incompatible browser

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 any general.useragent prefs are bold (user set) then right-click that pref and choose Reset.