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I have Ver 12 installed & a website says I need Ver 8 or 9 for it to function properly. Is there a way to make ver 12 run like Ver 8 or 9?

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The "IowaCollegeAid.gov" web site for filling out an application for financial Aid comes up with a window stating their web site will not work properly with my Firefox Ver 12 and it only supports ver 8 or 9. I tried to use Version 12 anyway but it appears not to work. Is their an option to make Ver 12 act like Ver 8 or 9 in this case or what else could I do? Do I have to reinstall a version 9 or is that even possible?

The "IowaCollegeAid.gov" web site for filling out an application for financial Aid comes up with a window stating their web site will not work properly with my Firefox Ver 12 and it only supports ver 8 or 9. I tried to use Version 12 anyway but it appears not to work. Is their an option to make Ver 12 act like Ver 8 or 9 in this case or what else could I do? Do I have to reinstall a version 9 or is that even possible?

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The first thing you need to do is to update to Firefox 20.0.1, with the latest security updates.

You can use this extension to temporarily change the string that website is looking at.
https://addons.mozilla.org/en-US/firefox/addon/user-agent-switcher/

Or you can use Firefox Portable 9.0.1 which will install all by itself without affecting your regular Firefox installation.