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Can I install FF4 RC on Mac G5 - Dual 2.7 GHz Power PC - OSX 10.5.8 ?

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I downloaded FF4 RC but the FF app --> Applications Folder has a "no" symbol on the FF logo and will not allow me to drag/drop. If I delete old FF and replace with new FF4, when I click open the app I get a warning that FF "will not run on this architecture." But FF download page claims, " Mac OS X 10.5 and above. All Systems & Languages."

I downloaded FF4 RC but the FF app --> Applications Folder has a "no" symbol on the FF logo and will not allow me to drag/drop. If I delete old FF and replace with new FF4, when I click open the app I get a warning that FF "will not run on this architecture." But FF download page claims, " Mac OS X 10.5 and above. All Systems & Languages."

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It only works on Intel Macs. There is a third-party version that works on PPC Macs, for details see http://www.floodgap.com/software/tenfourfox

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Humph... They say ALL systems. Screw it... Moving over to Safari. Gah!