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when i print from firefox, i get an error on my printer asking for custom 1

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my guess is there is a default media type setting as i can print fine from every other program, its only from mozilla!! the error on my printer is add paper type custom 1 which is amedia mismatch error how do i set default print media type to plain?

my guess is there is a default media type setting as i can print fine from every other program, its only from mozilla!! the error on my printer is add paper type custom 1 which is amedia mismatch error how do i set default print media type to plain?

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