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I downloaded FF to up grade and the icon appears with a circle with a line across not allowing me to install it

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FF icon has a with circle with a line across, not allowing me to install

FF icon has a with circle with a line across, not allowing me to install

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Sorry, the official version of Firefox 4 is not available for PowerPC Macs.

You can download and re-install the previous version here: http://www.firefox.com/all-older.html

or you can find an unofficial version for PowerPC here: http://www.floodgap.com/software/tenfourfox/