Fennec, the mobile version of Firefox has been updated for both Nokia and Windows Mobile phones.
Fennec Beta 2 for Nokia devices includes a new theme, built-in JavaScript error console, and improved add-on support. Full changes can be found in the release notes.
For the Windows Mobile users, Fennec Alpha 2 increases performance, polishes the user interface, plus a list of other changes in the release notes.
Download Fennec Beta 2 (“Maemo”) for Nokia devices
Download Fennec Alpha 2 for Windows Mobile