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I can not open my bank account due to incompatibility with firefox 4.0

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I get the message from security "could not be installed because it is not compatible with Firefox 4.0" How can I go back to the previous versiin of Firefox?

I get the message from security "could not be installed because it is not compatible with Firefox 4.0" How can I go back to the previous versiin of Firefox?

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It may be because you appear to be running a BETA version of Firefox. Try using the Help | Updates route to update to the full release first. You can also download the full release from here: Download Firefox 4.0

You can downgrade at any time by downloading v3.6.16 from here: Download Firefox v3.6.16

Then go to Add/Remove programs and uninstall the current version, but choose to keep your bookmarks, customizations etc. Finally, reboot and then run the installation file you downloaded.

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If your bank uses Trusteer Rapport, see this after updating to the 4.0 release version.
http://www.trusteer.com/faq/does-rapport-support-firefox-4