I can only use version 4.0 for my online college classes so how can I go back to using version 4.0?

I upgraded to version 5.0 but am unable to use because it is not supported with my online college platform. How can I go back to using version 4.0? If I do not find a solution I will have to find a new browser.

I had the same problem (issue with Google Apps and XUL runner etc) of needing to downgrade. To pull it off I went to the main Firefox download page (http://www.mozilla.com/en-US/firefox/new/) and followed the link to OTHER SYSTEMS AND LANGUAGES which took me to a page that included a link on the right hand side to download Firefox 3.6.16.
(The stuff below pertains to Windows. If you are on a different OS your steps will vary)
To do the actual downgrade (and there may be some other steps that would be wise to take but this is what worked for me) I merely renamed "c:\Program Files\Mozilla Firefox" to "c:\Program Files\Mozilla Firefox bad" (in case I want to try troubleshooting the issue later) and then ran the "Firefox Setup 3.6.16.exe" file that downloaded from that link. That solved my problem and I'm back and running 3.6.16.
In case you don't feel comfortable changing things in your Program Files directory you might try a different approach and try uninstalling via the Control Panel and Add and Remove Programs (or whatever it is called on the version of Windows you are on) and then running the installation file. I didn't go that route so I can't tell you how well that might work.

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