I found some articles regarding a cursor disappearance bug in Firefox, but my problem seems to be different. It's not so much that my curos disappears, but it resets itself away from a text box. So I will click on a text box, but when the page is done loading it will remove itself. Meanwhile, I'll be looking down and typing only to look up after hitting backspace to find that Firefox has interpreted my backspace to mean "go back a page!"
This seems to be a recent problem, maybe linked to the latest update. I'm using 3.5.6 right now. Any help would be appreciated.