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Can't update Firefox

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Whenever I launch FF I get a small message saying it was not possible to install the latest updates - check that there are no other instances of FF running. Well, there aren't, but I always get that message. How to stop it?

Whenever I launch FF I get a small message saying it was not possible to install the latest updates - check that there are no other instances of FF running. Well, there aren't, but I always get that message. How to stop it?

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If you have trouble with the upgrade, use this link; http://www.mozilla.org/en-US/firefox/all/

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Thanks. But it took ages to get it to work!

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