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i need to go back to firefox 3.6 for school, what steps do i need to do in order to get this done

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i have FF 5 and need to get back to version 3.6 for school. how do i do this?

i have FF 5 and need to get back to version 3.6 for school. how do i do this?

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Install Portable Firefox 3.6.x to your hard drive for use at your school's website.
http://portableapps.com/apps/internet/firefox_portable/localization#legacy36

It won't affect your Firefox 5 installation, like a "regular" version will.