Lost Firefox on my mac osx 10.5.8. won't download. Any ideas?

I try to boot it up and get the message: you cannot open the application firefox because it is not supported on this architecture. What do I do now?

New versions of Firefox do not support for Power/PC (PPC) processors. Firefox 3.6 supports PPC and Intel Macs. Firefox 4 and up requires an Intel Mac and is built for both 32-bit and 64-bit CPUs.
http://www.mozilla.org/firefox/system-requirements.html
There is a separate project called TenFourFox that brings an unoffical version of Firefox 7 to older Macs. I don't use it or a Mac myself, so I can't vouch for it, but you might want to give it a try.
http://www.floodgap.com/software/tenfourfox/

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