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I need firefox 4.0 as a browser for school assignments how to get back

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My online courses require me to use Firefox 4.0, i made a mistake and updated to 5.0 how can I get 4.0 as my browser?

My online courses require me to use Firefox 4.0, i made a mistake and updated to 5.0 how can I get 4.0 as my browser?

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You can identify as Firefox 4 using this extension:

https://addons.mozilla.org/en-US/firefox/addon/user-agent-rg/

If the Firefox 4 user agent doesn't work, try identifying as IE7, which always works for me on my school email.