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how do i go back to the previous version of firefox

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After updating to ver. 5 i lost some of my adds on , and the small windows after pointing at the tabs , so how do i go back to my previous version of Firefox ?

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You can use the Compatiblity Reporter add-on to re-enable your add-ons and test them with the version of Firefox.

or you can find older version of Firefox here: http://www.mozilla.com/en-US/firefox/all-older.html