I keep my computer on all the time, and Firefox is open most of the time also.

But today I went into task manager, and saw the memory usage at 2.1 GB, and I have 2GB RAM

Of course when I saw that I checked what program takes that much memory, and to my surprise it was Firefox. It was taking ~ 1.1GB of memory !

I closed it, and opened it again, and now it's 53 Megs. But it seems everything I do keeps adding up, even when I close pages (or tab) it goes down a little bit, but still higher than when I opened the page.

Is there a setting somewhere that tells it to cache everything in memory (or something like that) ?

I have Firefox version 3.0.5