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Why does some printing look like some kind of encrypted code?

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When I attempt to print an e-mail without going to the Firefox print choice, some will print with no problem while others print in some unrecognizable code.

When I attempt to print an e-mail without going to the Firefox print choice, some will print with no problem while others print in some unrecognizable code.

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Caused by a Bug in Firefox, which the user can sometimes by-pass by opening Print Preview and using the Print button from that window.