Script Summary: Stops the infuriating and unnecessary "Session has timed-out" message. Also works in Chrome.
Firefox users need to install the addon 'greasemonkey' to make userscripts, like this one, work; else clicking the install button will result in a page of source code. Chrome works out of the box.
If you have an idea for a script then tell me about it in my comments section. I probably won;t do it and I doubt I'll reply even if I do but post away merrily and you never know.