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am unable to update latest firefox...have mac OS X 10.5.8, 1GHz PowerPC G4 Processor, 512 MB SDRAM...why can't I update?

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I am unable to update firefox 4...have mac OS X10.5.8, 1 GHz PowerPC G4, 512 MB SDRAM...why can't I update?

I am unable to update firefox 4...have mac OS X10.5.8, 1 GHz PowerPC G4, 512 MB SDRAM...why can't I update?

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Firefox 3.6.x is the last available from Mozilla for PPC Macs.
http://www.mozilla.com/en-US/firefox/all-older.html

For older Macs that aren't supported in Firefox 4+ versions, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/
http://tenfourfox.blogspot.com/
https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported