Web browser leakage uses up almost all memory

I consistently find that when using Safari (or Firefox), within a short period of time (sometimes even less than one hour), the browser has taken over nearly all available memory. This happens even when the browser is the only program in use, and when no webpages with extensive audio or video content are open.
Can someone explain to me why this happens -- i.e., why web browsers seem to hog all the memory they can find -- and (more importantly) whether I can take steps to prevent it from happening?
Thanks.
As an example, my current System Memory readings (from Activity Monitor), with only 'Firefox' and 'Activity Monitor' open, are:
Free memory . . . 74.9 MB (but frequently dropping to less than 10 MB)
Wired . . . 228.4 MB
Active . . . 1.20 GB
Inactive . . . 504.5 MB
Used . . . 1.92 GB
VM size . . . 31.99 GB
Page ins . . . 292.1 MB
Page outs . . . 120.6 MB
Swap used . . . 518.7 MB

<<< Which release of Safari are you using? Your original profile suggests you are still on OS X 10.6.3
The most recent release of Safari (5.1.7) for OS X 10.6.8 seems to keep more free RAM available (and thus offers a bit better performance with fewer beachballs) than Safari 5.0.5, the version I used extensively before recently updating to OS X 10.6.8 to get the anti-Flashback security updates. >>>
I'm actually using OS 10.6.7 (not 10.6.3).  I'll update to 10.6.8 now that you've made me aware of it (thanks), but I don't see why that will make any difference regarding this particular problem.
I'll also update Safari (I'm back a few revisions on that one), but there too, I don't expect any pleasant surprises.  (I don't recall ever seeing a performance improvement from an update.)
My inquiry was primarily directed at the use of the Firefox browser.  However, when I've switched (in frustration) to Safari, I've seen negligible difference in performance, or regarding the particular issues I've posted about.
Even you characterized the performance gain as "a bit better."  This problem cries out for much more than "a bit."
Thanks for your reply.

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