I tried to update my old Firefox with Version 4. Received message: You can not use this application Firefox.app with this version of Mac OS X. How do I get my old version back, or make version 4 to work for me?

My Mac OS is 10.4.11
I do not know which version of Firefox did I have

Here is the system requirements page: http://www.mozilla.com/en-US/firefox/system-requirements.html.
http://www.mozilla.com/en-US/firefox/all-older has the latest 3.6.x version, and http://www.floodgap.com/software/tenfourfox/ is another option.

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