Is there any way to limit the memory firefox can use?

once firefox reaches about 150Mb of memory it starts locking up and even if I manage to close it through taskmanager it still does not release the memory it was using.Is there any way to set a limit on how much memory firefox can use and a way of making sure it releases it again when shut.I run a dual core 1.8Gb cpu 2 Gb of ram and Win xp Pro service pack 3

See:
* http://kb.mozillazine.org/browser.sessionstore.max_windows_undo
* http://kb.mozillazine.org/browser.sessionstore.max_tabs_undo

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