While Firefox is a great browser, if you use it on the Mac you are probably used to it crashing. A lot! If you want to keep Firefox from crashing on your Mac, try using one of the Firefox builds optimized for the Mac. At this site (http://firefoxmac.furbism.com/) they have builds optimized for G3, G4, and intel-based Macs. The builds are made nightly so you can always get the latest nightly build or the latest release of Firefox. I've found that using the builds from this site greatly reduces the crashing of Firefox on the Mac.