Nvidia Tegra (ARM 11 with GPU & DSP) which is going to come with Windows CE has been shown running the desktop version of Firefox 3.5
This a day after someone showing a android cortex machine running firefox.
Why is this intresting - well it managed 4 tabs at once. It means someone has compiled an ARM Linux version. And a WinCE ARM version of desktop firefox. Maybe some of the work here will make it easier to use Firefox on RISC OS on these new processors.
It does somewhat show of the power of these new chips being that a cortex should be 2 x the CPU performance of the tegra.