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I upgraded to the newest version of Firefox, but I need the old version for several websites and cannot find the download for the older version. Where can I find it?

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I just upgraded to Firefox 4, but some important websites I need to visit are not compatible with this version. Where can I find a download of prior versions?

I just upgraded to Firefox 4, but some important websites I need to visit are not compatible with this version. Where can I find a download of prior versions?

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