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When I open Firefox docs in my email, I get so many repeating windows my Mac freezes

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On occasion I get an attachment in my email that opens with Firefox. As soon as I open the attachment my screen suddenly goes crazy with repeated blank windows. They cannot be stopped and the computer freezes up so I have to reboot. I do not have this problem with attachments that do not use Firefox to open.

On occasion I get an attachment in my email that opens with Firefox. As soon as I open the attachment my screen suddenly goes crazy with repeated blank windows. They cannot be stopped and the computer freezes up so I have to reboot. I do not have this problem with attachments that do not use Firefox to open.

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What are you calling "Firefox docs"? That can happen when you have Firefox set to open file types it doesn't handle normally, like Word .doc files or PDF files.

http://support.mozilla.com/en-US/kb/Managing+file+types