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Help:About Firefox: SHOWS 4.0 - but when I attempt to download an add-on - it says I still have 3.05

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I have tried to upgrade to 4.0 many times - but when I attempt to download an add-on that is only for 4.0 - it says that I have version 3.05 - need to update. But when I go to Help:About: - it says up to date - no updates available.

I have tried to upgrade to 4.0 many times - but when I attempt to download an add-on that is only for 4.0 - it says that I have version 3.05 - need to update. But when I go to Help:About: - it says up to date - no updates available.

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