well okay thats very unlike unless there is a second process called firefox.exe ^_^
I just don't understand why my firefox isn't occupying if I leave it be as it is... and didn't do anything special with it :/
it only rises when I'm browsing, because it saves the sites I loaded and also adds them to the history.. but thats normal.. and if i ever notice it to get too hight (never did that before) I could just minimize it... or restart it and have it reloading my sites.
btw I don't know if one of the links I posted did tell you how to make FF stop using your ram and make it possible for windows to use it for other programms instead...but that is also possible, maybe this can help you too. ^^
but it's just as I said.. I would either use Safari or FF... and not Google Chrome as long as it is a beta
see the link with security holes... and don't underestimate it, Chrome is beeing discussed in a lot of forums at the moment and on a gaming forum (for WoW) 2 people had to reinstall windows most likely because of google chrome.