Firefox sometimes takes 100% of one of my four CPUs under Windows (7)

Question

A few times a day I'll hear the CPU fan running, or my PC starts responding slowly. Sometimes it won't open (maximize) from the task bar. I usually have to Control-Alt-Delete to go to processes. When I do, Fire Fox is using 100% of of of my quad CPU's processors. I have to kill the process to fix the problem.

Answer 1

I see the same problem as your client in Firefox 16 on Windows 7. To fix the problem, add clear: left to the style for leftColMain
#leftColMain {
    clear: left;     float: left;
    padding: 30px 0 0;
    position: relative;
    width: 210px;