Firefox Ignores Scroll Wheel in Snow Leopard

[kernel_panic]

Installed Snow Leopard on Friday, and I'm only having one problem: Firefox is ignoring the scroll wheel on my Logitech LX3 Optical Mouse. The OS and all other apps seem to be fine. I followed a tip on tuaw.com to reinstall the Logitech Control Center, but it didn't fix the problem. I plugged in my Mighty Mouse, but it won't scroll either. I can scroll inside a textarea, but not the main Firefox window. Scrolling worked fine before the Snow Leopard upgrade.

MacOS X 10.6.1 | Firefox 3.5.3

 

[kernel_panic]

Normally, the up and down arrows on the keyboard can be used to scroll. I just realized that this isn't working either. I even started Firefox in Safe Mode with no luck.