TenFourFox is a fork of the Mozilla project for Mac PC Power computers and laptops. It was updated to TenFourFox 11. Firefox versions 12 through 17 are in the unstable branch. As Firefox dropped support for Mac PC Power computers some years ago, this remains this only viable way classic Mac lovers can get an up to date browser. Even older Mac hardware - pre Mac OSX is supported by the Classilla browser project.