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I've downloaded Firefox 4 only to find out it won't run on my non-Intel chip Mac G5 running OS 10.4.1. How do I get Firefox 3.6 back?

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There's a circle slash in the icon and when I try to run Firefox I get a message that the program won't run on the computer's architecture.

There's a circle slash in the icon and when I try to run Firefox I get a message that the program won't run on the computer's architecture.

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Download it from here Firefox 3.6.16

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Thanks. I found it at another site. http://mac.softpedia.com/progDownload/Firefox-Download-3007.html How come there's no way to get to 3.6.16 download from the main Firefox page? And are the system requirements posted on the version 4 download page? If they are I didn't see them.