Firefox 4 won't run on my Mac running OS X 10.5.8. The downloaded icon has a slash through it and I get a message saying it can't run on this architecture.

what are the sys requirements for running firefox 4 on a mac? Please put sys requirements on you web page. I couldn't find any sys requirements. thanks

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

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