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Can't update to new version.Diagonal line on icon to drop into applications folder.

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Downloaded new version of Firefox but the pop-up to drag the Firefox icon into the applications folder doesn't work and there is a white circle with a diagonal line through the Firefox icon. Above the blue area on top of the pop-up it states, "1 of 2 selected, Zero KB available" Why?

Downloaded new version of Firefox but the pop-up to drag the Firefox icon into the applications folder doesn't work and there is a white circle with a diagonal line through the Firefox icon. Above the blue area on top of the pop-up it states, "1 of 2 selected, Zero KB available" Why?

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Firefox 4 versions and later do not run on a PowerPC Mac.
Firefox 4 and later require at least OS X 10.5 and an Intel Mac.

For an unofficial Firefox 8 compatible version (TenFourFox) that runs on PowerPC Macs with OS X 10.4.11 or OS X 10.5.8 you can look at:

Firefox 3.6.x (Mac OS X 10.4 and later) can be found here: