Cache problem with firefox

on the Imageboards Firefox has taken to remember exactly how pages were.... this means if i replyed to a post firefox would show the page EXACTLY as it was before i posted. I figured out it was the cache which was doing this so i cleared it.... however everytime i want to go on 4chan i would have to clean my cache before i could view anything. The only extension i have is the most recent version of the 4chan extension and its never done this to me before in the years ive had firefox.
Im running 1.5.0.4

Im also not switching to Opera because ive already tried it
In before www.opera.com

My extension version is 0.4.3.1 what's yours?  There was an update yesterday but you need to restart your browser.