Thanks for the upgrade to Firefox 4! Unfortunately, you don't say anywhere that it's not compatible with OSX 10.4. Might want to fix that so that other users don't run into this issue.
After the latest upgrade to 3.whatever, Firefox asked if I'd like to upgrade to 4.0. I said yes, assuming (since Firefox has always been compatible before) that it'd install and work. It didn't. Why? Because Firefox is no longer supporting OSX 10.4, apparently. This should probably be noted SOMEWHERE so that trusting people like me don't screw up our existing Firefox.
The system requirements page shows it require OS X 10.5 or 10.6 and an Intel processor - http://www.mozilla.com/en-US/firefox/system-requirements.html
The LINK from the Firefox page where you can update from doesn't show anything. Not only does it NOT show that 10.4 is no longer supported, there's nothing linking to the system requirements page.
In fact, now that I'm on a windows machine, I see that it doesn't say which versions of Windows 4.0 works with.
I'm not looking for a "go to the systems requirements page" answer, I'm looking for an actual change to the description of what the download is FOR. It'll help current and future Firefox users, and ultimately improve communications with the end user.
I looked for a link to the system requirements page before I downloaded to my PowerPC Mac, but I couldn't see it anywhere. However, I saw that Mozilla was bragging about supporting Windows XP whereas the new IE 9 did not. One would assume that if Mozilla was bragging about supporting that old Windows platform, they would also support a Mac platform of the same vintage. I did not assume wisely. I am very disappointed in the Mozilla team.
For the record, I am running the latest version update of Leopard (10.5.?) on my PowerBook G4.