Well, sometimes after a prolonged session the web doesn't load unless I move my mouse around a bit. For instance, I click a link to something, the tab icon shows a sign of loading for about half a second and then it just stops. If I move the cursor with the mouse (or trackpad), the loading continues and finishes. This problem resolves itself when I restart Firefox, but I still want to know its cause and how I can prevent it. I don't know what to make of this, and the circumstances are odd enough that Google is not helping me figure this out for myself. So I'd like to know if anyone can help me out.