So, you have tried to update FireFox. As a result, you can no longer use FireFox on your machine? If so, try and install FireFox 3.6 again. Firefox 3.6.x is the last version of Firefox available from Mozilla for PPC Macs and 10.4. http://www.mozilla.com/en-US/firefox/all-older.html For older Macs that aren't supported in Firefox 4+ versions, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . http://www.floodgap.com/software/tenfourfox/ http://tenfourfox.blogspot.com/ https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported Thanks to [[https://support.mozilla.com/en-US/user/243 the-edmeister]] for the reply to [[https://support.mozilla.com/en-US/questions/906305?s=mac+os+10.4.4&r=4&as=s I have a Mac 10.4]]