Choppy scrolling, weird menus
I'm running Firefox 10.0.2 on my 64-bit 4-core AMD system, with Thunderbird too. In both Mozilla products, I'm having these problems:
1) mouse scrolling is rough and uneven, very choppy.
2) Menus appear in top bar when I hover there, as expected. But when I click on one, it doesn't drop down, or hesitates, or takes several clicks, then may fade in and out.
I also have a Windows hard drive in this same machine.
I run the same Firefox and Thunderbird in that environment, and do not have these problems.
What to do?