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Firefox won't update - tho I have OSX 10.5.8 it keeps saying I have too old an OS. The auto-update for Firefox is greyed out. How can I update?

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I have a Mac Powerbook G4, running OS X 10.5.8. I'm getting messages from Google that Firefox is an old version and needs updating - so I went to the Firefox website and the message said that "Unfortunately the latest version of Firefox isn't compatible with your computer's operating system. Learn more." When I click Learn More, it says that Firefox only works with OS X 10.5 and 10.6...The auto-update box for Firefox is greyed out and un-clickable in Firefox preferences, there's no manual download that I can find - how can I make Firefox recognize my OS and allow me to upgrade? Many thanks.

I have a Mac Powerbook G4, running OS X 10.5.8. I'm getting messages from Google that Firefox is an old version and needs updating - so I went to the Firefox website and the message said that "Unfortunately the latest version of Firefox isn't compatible with your computer's operating system. Learn more." When I click Learn More, it says that Firefox only works with OS X 10.5 and 10.6...The auto-update box for Firefox is greyed out and un-clickable in Firefox preferences, there's no manual download that I can find - how can I make Firefox recognize my OS and allow me to upgrade? Many thanks.

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PPC Macs aren't compatible with Firefox 4.0 and later versions.

For older Macs that aren't supported in Firefox 4 / 5 / 6, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/
http://code.google.com/p/tenfourfox/downloads/list

Or use Firefox 3.6.22.
http://www.mozilla.com/en-US/firefox/all-older.html

Les dette svaret i sammenhengen 👍 0

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PPC Macs aren't compatible with Firefox 4.0 and later versions.

For older Macs that aren't supported in Firefox 4 / 5 / 6, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/
http://code.google.com/p/tenfourfox/downloads/list

Or use Firefox 3.6.22.
http://www.mozilla.com/en-US/firefox/all-older.html

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Thank you - will try the tenfourfox. Already have the old Firefox; hence all the warnings that I'm working on an old version...

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Those warnings aren't about Firefox 3.6.22, which is still supported by Mozilla. The Firefox 3.0.5 version you posted here with went out of support a couple of years ago, hence the warning you received.