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My school website will not run on the new version of firefox. How do I return to the earlier version of firefox?

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I installed the newest version of Firefox and found that it does not support Connections Academy. How do I return to the previous version of Firefox that I was using?

I installed the newest version of Firefox and found that it does not support Connections Academy. How do I return to the previous version of Firefox that I was using?

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You can find the previous version of Firefox at http://www.firefox.com/all-older.html