Mozilla says it’s unlikely that the final version of Firefox 4 will run on older Macs with PowerPC processors, according to “Computerworld” ( Apparently, you’ll need a Mac with an Intel processor.

“We are not likely to be supporting PowerPC,” said Mike Beltzner, director of Firefox, in a message Tuesday on the discussion group. “[But] no announcement has been made yet, as I’d like to have the data to back it up, and am having trouble getting it.”