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I run System 10.5.8 on a Mac and receive the reply "You can't open the application 'Firefox.app' because it is not supported on this architecture."

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I always update to your newest Firefox configuration and did so when I was asked to upgrade to "Firefox 4" for the Mac. When I tried to access my account I receive the above message. I dumped the upgrade which wiped my Mac clean of all my bookmarks and again downloaded Firefox 4 but with the same result. Tried to switch to Safari but this too was unsatisfactory. I'm guessing I need to return to a previous Firefox upgrade and never again try and upgrade. How do I do this?

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Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox

If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

Mozilla are working to prevent Mac users with non-compatible systems from getting the notification about Firefox 4, and also not displaying the "Download Firefox 4" button on http://www.mozilla.com