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Which version of Firefox will use the least resources?

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I have an older pc, with 600Mhz processor, 130MB memory, and running win2000 sp4 I want the version of Firefox that uses the least processor and memory resources, but is stable and functional with most websites.

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You should be able to use the latest Firefox 3.6.8 version on your computer.

See http://www.mozilla.com/firefox/system-requirements.html - Firefox 3.6 System Requirements

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Yeah, that's the one that uses the most resources. Any chance I can get a real answer to the question?

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Based upon my experience with a similar (550MHz) processor and 768MB of RAM on W2K SP4, Firefox 2.0.0.20 is the last version that works efficiently on an old PC like that; but many websites are not allowing that old version access any more. IMO, any 3.0+ version is going to be slow.

Try using K-Meleon - same source code as Firefox, and it is made specifically for Windows operating systems. http://kmeleon.sourceforge.net/download.php