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my work web mail is not compatible with firefox 5. they asked me to go back to 4 or use internet explorer. how do i go download 4?

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my work web mail will not work with firefox 5. it makes it run in a basic, not advanced mode. when i called the IT folks at work they told me to go back to firefox 4 or use internet explorer. the latter option is unacceptable. but i cannot find firefox 4 on your site.

my work web mail will not work with firefox 5. it makes it run in a basic, not advanced mode. when i called the IT folks at work they told me to go back to firefox 4 or use internet explorer. the latter option is unacceptable. but i cannot find firefox 4 on your site.

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Due to security vulnerabilities, rolling back to Firefox 4.0.1 is not recommended.

Does your work webmail use a common interface like Outlook Web Access or Google Apps? Perhaps there is a workaround.