Again with win7...

Firefox 3.6.9 Windows XP SP3 Intel core2 duo 2.2, 1G ram, running SQL Server, 20 odd apps open, some large, 30 odd firefox tabs open over a couple of FF windows, not rebooted for a week:

33652.1ms +/- 0.9%

Firefox 3.6.9 AMD Phenom quad core 2.2GHz 4G ram Windows 7 x64, very little running, 10 firefox tabs max.

44705.9ms +/- 0.6%