Should I 'uninstall' old Firefox updates after installing Firefox 8?

I'm strictly a "button pusher" and have no clue to the 'how' a computer or its programs work. I had Firefox 1.0.6. 3.5.5, on up to 3.6.8 and I've just installed the latest Firefox 8. Am I supposed to get rid of the old versions or just leave them on the computer. I am assuming that I can't just 'delete' them but must uninstall them; is this correct or do I just leave them there?
Thanks for any help offered.

If you've updated Firefox every time then the previous version has been replaced by the new updated version.<br />
If you only see entries of older Firefox versions in Add and Remove programs then that are leftover orphaned entries that haven't been removed by the Firefox updater, but the files of that older version are no longer present.

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