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I have an iMac G5 running OSX 10.5.8. Is there a way to get an older version of Firefox that is compatible with this machine and OS?

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The G5 is a Power PC

The G5 is a Power PC

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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/

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Chosen Solution

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/