Whenever there is a new release of Firefox
I anxiously await Neil Lee's optimized version. Neil aims to please, and he just announced on his blog
that he has whipped up optimized versions of Firefox 2.0 for G4, G5, and Intel Macs. Please keep in mind that this optimized version can't use the Firefox icon, or the Firefox name. You'll see a variant of the icon to the right, and the app will identify itself as BonEcho. Why? As Neil explains the name and icon are for official builds only, and this ain't official, baby.
One of the nice touches in these builds are the Aqua form widgets, but there is a version with the Firefox default widgets if that's your cup 'o tea. Anyway, get to downloading and thanks, Neil!