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Unsupported version for FedTraveler.com

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I access "FedTraveler.com" from my iMac using Firefox. When I opened Firefox I was asked to upgrade to Firefox 4.0 which I did. When I tried to access FedTraveler.com I got a window declaring I was using an unsupported version of Firefox (they support version 3.0, 3.5 and 3.6). I was unable to proceed. Can I revert to one of the supported versions and how would I do that?

I access "FedTraveler.com" from my iMac using Firefox. When I opened Firefox I was asked to upgrade to Firefox 4.0 which I did. When I tried to access FedTraveler.com I got a window declaring I was using an unsupported version of Firefox (they support version 3.0, 3.5 and 3.6). I was unable to proceed. Can I revert to one of the supported versions and how would I do that?

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Here's the process to roll back:

First, I recommend backing up your Firefox settings in case something goes wrong. See Backing up your information. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)

Next, download and save Firefox 3.6 to your desktop for future installation. http://www.mozilla.com/firefox/all-older

Close Firefox 4.

You could install Firefox 3.6 over it (many have reported success) or you could uninstall Firefox first. If you uninstall, do not remove your personal data and settings, just the program.

Unless you have installed an incompatible add-on, Firefox 3.6 should pick up where you left off. If there are serious issues, please post back with details.

Note: I haven't actually tried this myself!