Just downloaded beta 4 and get a msg saying does not work on this architecture, I'm on a Mac Powerbook G4 running OS 10.5.8. Can I somehow uninstall and go back to the latest version, without losing all my stored data (bookmarks, etc.) if so how?

That's about it. Whenever I try to launch the beta version I get the won't run on this architecture message.

Firefox 4 requires at least OS X 10.5 and an Intel Mac.
You can re-install Firefox 3.6.15 and it will automatically use your existing bookmarks.

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