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I need a lower version of Firefox for my child's online school. I need Firefox 3x. How do I get it?

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I need Firefox 3x because my child's online school says that is what we must use.

I have a higher version how do I get version Firefox 3x?
I need Firefox 3x because my child's online school says that is what we must use. I have a higher version how do I get version Firefox 3x?

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Install Firefox Portable 3.6.20 to your hard drive for use at that website.
http://portableapps.com/apps/internet/firefox_portable/localization#legacy36