I've tried searching for this and haven't found another thread so please forgive me if I missed it. I really need to get Firefox working. I'm running a Dual 1.42GHz PowerPC G4 with 1.75Gb of RAM I had Firefox 3.0.3 running great with OSX 10.5.4. I install the new 10.5.5 update and now Firefox won't start up. I double click on the Icon in the Icon bar and it bounces a couple of times then.....nothing. I try double clicking the icon in the Applications folder and ...nothing. I re-install Firefox 3.0.3 and try again, then 3.0.1, then 126.96.36.199 and still nothing with any of them. I've also tried backing up then deleting the Firefox folder in the Application Support folder before re-installing and still nothing. I copy the folder back and still nothing. Please help...it's getting really frustrating. My next step I guess will be to re-install OSX 10.5.4. if I can't find other suggestions.