Certain features don't support Firefox 5, where can I download fFirefox 4?

Plug-in for a website training seminar does not support Firefox 5. I need to reinstall an earlier version of Firefox, but can't find one.

Did you install 4.0? If so, please take these extra steps before installing 3.6 to protect your profile information.
First, make a backup of your computer for safekeeping. To back up Firefox, see [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information].
Next, download and save Firefox 3.6 to your desktop for future installation. http://www.mozilla.com/firefox/all-older
Close Firefox 4, and uninstall it. Do not remove your personal data and settings, just the program.
Then finally you can reinstall Firefox 3.6. Unless you have installed an incompatible add-on, it should pick up where you left off. If there are serious issues, please post back with details.
Note: I haven't actually tried this downgrade myself!

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