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Why can't I upgrade to Firefox 4.0, I have Mac OS 10.5.8, with Processor PowerPC G5 (3.1); Speed 2.1 GHz

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Why can't I upgrade to Firefox 4.0, I have Mac OS 10.5.8, with Processor PowerPC G5 (3.1); Speed 2.1 GHz

Why can't I upgrade to Firefox 4.0, I have Mac OS 10.5.8, with Processor PowerPC G5 (3.1); Speed 2.1 GHz

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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/