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What is the best version of Firefox to download for Mac 10.5.8

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I need to download Firefox on my Mac OS X 10.5.8 I have read of incompatibilities with Firefox 4. What is the best version of Firefox to download for my Mac.

I need to download Firefox on my Mac OS X 10.5.8 I have read of incompatibilities with Firefox 4. What is the best version of Firefox to download for my Mac.

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3.6.x is the last version for 10.5.8.

http://www.mozilla.com/en-US/firefox/all-older.html