Version 4 will not open with Mac G4 System10.5.8 Replace ver3 now no Firefox at all . How do I get back to Ver 3 or get Ver 4 to open

I down loaded Firefox 4 to my Mac Laptop G4 running operating system 10.5.8, 1.67ghz, 2gig ram. When install it in the applicatiion folder I replaced the version 3.6x that I was using. When I try to open Ver 4 I get an error message that iy cant open because it is not supported on this architecture. How do I get it to open or how do I get back to version 3.6x So i dont loose all my bookmark. For some reason Firefox on my backup disk says it has an error code and can not load

Sorry, but as you discovered, Firefox 4+ no longer support the PowerPC CPUs.
I recommend backing up your Firefox settings in case something goes wrong with the reinstall. See [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)
Next, download and save Firefox 3.6 from here: http://www.mozilla.com/firefox/all-older
Does that work (i.e., pick up your profile automatically)?
There's also an unofficial build using Firefox 5 code adapted to the PPC platform. You can read about that here: http://www.floodgap.com/software/tenfourfox/

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