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I cant upgrade my version of firefox

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I cant upgrade my version of firefox. It runs but when i try to get an addin it says i'm still using my older version

I cant upgrade my version of firefox. It runs but when i try to get an addin it says i'm still using my older version

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Uninstall Firefox. Search Firefox in your Windows drive (C:\) and DELETE all folders found.

When you are done, restart your computer and re-download Firefox from http://www.mozilla.com/en-US/firefox/fx/.

Check and tell if its working.