You can get the last version of Firefox 3.0 from ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/3.0.19-real-real/mac/en-GB/ (I selected the en-GB version as that is what you currently have) The latest version of Firefox that works on the PPC Mac is Firefox 3.6, available from http://www.mozilla.com/en-US/firefox/all-older.html There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox