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Mac G4 w/OS 10.5.8, New download won't open-not supported on this architecture, worked perfectly w/3.6 & down load said it will support Mac OS 10.5, what do I do to not lose all my bookmarks, etc?

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I had 3.6 & the website said new Firefox, need OSX 10.5 or above. Now the icon in the dock has a white circle w/slash like do not enter & when I click on it, a box opens that says,"You cannot open the app Firefox because it is not supported on this architecture." How can I get my Firefox back without losing all my info on my previous version?

I had 3.6 & the website said new Firefox, need OSX 10.5 or above. Now the icon in the dock has a white circle w/slash like do not enter & when I click on it, a box opens that says,"You cannot open the app Firefox because it is not supported on this architecture." How can I get my Firefox back without losing all my info on my previous version?

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The latest version for PPC users is 3.6.25 available at http://www.mozilla.com/en-US/firefox/all-older.html