I need to replace 5.0 with 3.6 so that I can take a class - it doesn't seem to have worked.,
I went thru the link that I saw somewhere in your doc to replace 3.6 - but it still says 5.0.1. Do I need to delete 5.0 first? If so, how?
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Install Portable Firefox 3.6.x to your hard drive to use at that website, and continue using Firefox 5 elsewhere.
http://portableapps.com/apps/internet/firefox_portable/localization#legacy36
While going back to an older version of Firefox usually works fine, depending upon the add-ons you may have installed, you could end up with compatibility issues with add-ons after reverting to an older version.
Portable Firefox installs completely separate from the regular Firefox installation, and won't affect your current Firefox version.