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I downloaded Firefox 4; It's not supported on my OS; now i've lost everything; I'm screwed; thanks Mozilla

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Is there any way to re-load Firefox 3 onto my computer? My computer can't support the latest Mac OS so it doesn't support Firefox 4 and I've now lost the old firefox and everything associated with it in the process.

Is there any way to re-load Firefox 3 onto my computer? My computer can't support the latest Mac OS so it doesn't support Firefox 4 and I've now lost the old firefox and everything associated with it in the process.

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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/

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