The only currently supported versions are Firefox 6.0 and Firefox 3.6.20.

• You are using Firefox 5.0 which is no longer supported
• All other versions of Firefox have security and stability issues that have not and will not be fixed.
• No responsible volunteer posting here will give you a link to any version other than the 2 supported versions.

Please post a new question with whatever questions you have or problems you are experiencing with Firefox 6 and one of the volunteers here will try to assist you.

• Ask a New Question: https://support.mozilla.com/en-US/kb/ask

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I am a student at Penn State. The online course management system used by PSU is supported by versions 3 or 4 only. The tech help desk at PSU informed me that I need to run one of those versions.

If its for just 1 website, use Mozilla Firefox Portable Edition

• http://portableapps.com/apps/internet/firefox_portable

Install Firefox Portable 3.6.20 to use at that web site. It won't affect your current version of Firefox at all.

Check and tell if its working.