I use Mozilla Firefox. If I put my cursor on a thread before I click it I can see the first few sentences of the thread for as long as I want. Lately the little box that would show a sampling of the thread comes up and goes real fast once and I can't read what the thread is about. What setting can I go into to fix this? It is intermittent where one month the box will stay up for as long as I need it and then another month it never pops up.