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I'm having trouble trying to upgrade to verison 4.0. How can I revert back to the latest version of Firefox 3.6?

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I deleted the latest version of Firefox 3.6 in order to try to download Firefox version 4.0. The download of version 4.0 was unsuccessful, probably because I have an old iBook G4 (10.4.11). How can I reinstall/download the most recent version of Firefox 3.6?

I deleted the latest version of Firefox 3.6 in order to try to download Firefox version 4.0. The download of version 4.0 was unsuccessful, probably because I have an old iBook G4 (10.4.11). How can I reinstall/download the most recent version of Firefox 3.6?

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For older Macs that aren't supported in Firefox 4.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/

You can get Firefox 3.6.16 here:
http://www.mozilla.com/en-US/firefox/all-older.html