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Unsupported architecture for FireFox??? Mac OS10.5.8

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I downloaded FireFox 4.0 and then when I went to use it, I got the Message "this is unsupported architecture". Ridiculous! Should I go back to Internet Explorer or use Safari from now on???

I downloaded FireFox 4.0 and then when I went to use it, I got the Message "this is unsupported architecture". Ridiculous! Should I go back to Internet Explorer or use Safari from now on???

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http://www.mozilla.com/en-US/firefox/4.0/system-requirements/

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/

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Try again, Jeffstrayer; I had the same message at first and also have an Intel processor on my Imac. I tried again a few days later and was successful.