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why cant i add websites to block

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why cant I manually add websites to block? With IE you can go in and put any address to block. So why not with Firefox? SO what if its one that Firefox allows to pop-up. I Don't want ANY pop-ups.

why cant I manually add websites to block? With IE you can go in and put any address to block. So why not with Firefox? SO what if its one that Firefox allows to pop-up. I Don't want ANY pop-ups.

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