Firefox 4 is apparently not compatibile with MacOS 10.5.8 PPC since after downloading and trying to open a pop-up says it is not compatible with my system. This version is probably for MacOS 10.5 Intel users. Unless there's another reason?

When Firefox 4 was proposed, I immediately checked the system requirements for Mac user:
"MacOS 5
MacOS 6"
So I downloaded it, since my OS is 10.5.8 (PPC), I thought I was fine. When downloaded, the Firefox icon showed a Stop sign in the middle: maybe a new logo? But when trying to open it, a window popped up saying this version was not compatible with my system. Therefore, using Time Machine, I reverted back to Firefox 3.6.16.
If this is the case, you should absolutely warn '''PPC''' users not to download Firefox 4. Your version is probably for '''Intel''' versions.
Unless you come up with a fix, I won't be able to use Firefox 4 until I change computers, having updated my system to the last possible upgrade.

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

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