More to the point, shouldn't the article say "requires an Intel processor" along with the bit about 10.5 Leopard??? I mean it's kind of important to know that if you still have an older PPC machine around. Firefox mentions neither.
I've noticed some other OSX applications don't even check for compatibility in their latest incarnations before updating a PPC app to non-working status. (e.g. If you're running Skype on a PPC machine, it will tell you there is an update available and then when you click OK, it installs an Intel only update and then tells you after you try to run it that it won't work on your architecture.). It's one thing to discontinue PPC support and quite another to not even tell people on the first version that discontinues that support....
Exactly. That is just some very sloppy support from Mozilla. Which is why I'm going to delete the FF 3.6 and not look back. A dual G5 with Leopard is still a very capable machine. It's unfortunate thats not what developers look when deciding on what their software will run on. FF 4 can run on Windows 2000, as in circa 2000, yet not on a very capable machine from 2004 with an OS from 2007.