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My daughter's online school will only work with 3.x, where can I find the older version to download and do I need to remove 5.x to do so?

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Question above, I hope is self explanatory. The online school has not updated their application for IE9 or FF5 so she needs a 3.x version to take her classes. This for High School courses not a university.

Question above, I hope is self explanatory. The online school has not updated their application for IE9 or FF5 so she needs a 3.x version to take her classes. This for High School courses not a university.

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Download Firefox 3.6.19:

Uninstalling Firefox

Installing Firefox (3.6.19) on Windows

Check and tell if its working.

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You can install the portable Firefox 3.6.19 version to access websites that do not work with Firefox 5+.