Mozilla’s Alex Faaborg has posted yet another peek at Firefox 3 extensive visual refresh.

This time he shares a partial collection of the different icon sets Firefox 3 will feature. As reported before, Firefox 3 will break with the restriction of keeping a very tight visual identity across all supported platforms and will instead aim to better integration with the operating systems through dedicated themes.

I have made a couple of mockups to give you an idea of how could Firefox 3 look on Windows XP when the theme updates land.

The first one shows the main navigation bar with the announced bigger back button fused with the forward button to provide a single history navigation interface.

The second one shows the Options window (again on Windows XP). As a work in progress, the Content icon looks the same as the Main icon and the Privacy icon looks more like a Security icon thanks to the lock. But hopefully you get the idea.

The Windows icons are being developed by The Iconfactory, an icon design firm responsible for Windows XP, Windows Vista, Xbox and Ubuntu icon sets among others.

The Mac OS X icons are being developed by talented Stephen Horlander and Kevin Gerich, the authors of the original Firefox theme.

For Linux, Tango-styled icons are being created by Andreas Nilsson, Kalle Persson, Ulisse Perusin, Jakub Steiner, and Lapo Calamandrei. While Michael Ventnor and Michael Monrealare tweaking Firefox to use default GTK icons if other than Tango.

Check Alex’s post for complete details. All the icons.