Thats more likely to corrupt your problem

Besides what everyones just said about pages not loading completely and clearing the cache, a fresh install should work. Did you delete the related registry keys, FF folder and application data for FF after uninstalling and before reinstalling FF?
Why would you want to delete the tabs, when you can just hide them using tools>options, the advanced icon - under browsing, of course this will only work when you have one webpage open in one window.
It still sounds more like a connection problem. Does this forum give you the same problem,
diyaudio.