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how do I retore to an older version of firefox

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some of the websites I use in my college is not compatible with the latest version of firefox. how can I restore to an older version of firefox?

some of the websites I use in my college is not compatible with the latest version of firefox. how can I restore to an older version of firefox?

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Try installing an older "legacy" version of Firefox Portable to your hard drive to use at websites that aren't compatible with the latest version of Firefox.
http://portableapps.com/apps/internet/firefox_portable/localization#legacy36

It won't affect your current Firefox installation as having two official versions of would.