I just downloaded Firefox 4.0, but it won't open with Max OS X 10.5.8. What's the problem?

When I try to open 4.0, the dialog box says it is not supported by this architecture. I has just loaded an update, 3.something, when I saw the promo for 4.0, so I downloaded it, which replaced the previous version, so now I have zero Firefox and am running Safari.

Yes, I have a second computer running Mac 10.4. The download does not warn that Firefox 4 will not run on older versions of OS X and I can find no access to older versions of Firefox via the Mozilla site. The link given by TonyE to http://www.mozilla.com/en-US/firefox/all-older.html states that 3.6 will be maintained "for a short time". I suppose it will make Apple happy that Mozilla are marketing 10.6 for them. The Firefox 4 download link needs to advise compatibility.

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