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Cant install firefox 4.0 on mac -Cant drag to Applications - The operation can't be completed...

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Can't install Firefox 4.0. It says, "The operation can't be completed because you don't have permission to access some of the items."

I just downloaded the app from Firefox, dragged it into my application folder and got a pop up saying "The operation can't be completed because you don't have permission to access some of the items."

Can't install Firefox 4.0. It says, "The operation can't be completed because you don't have permission to access some of the items." I just downloaded the app from Firefox, dragged it into my application folder and got a pop up saying "The operation can't be completed because you don't have permission to access some of the items."

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I just tried to install Firefox 4.0 and got this error.

I could not delete from Applications folder manually, as it was all ready deleted. It would not let me install by dragging to Applications

BUT i got it work by dragging to DESKTOP instead.