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Display artifacts running in portrait mode

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I am running Windows 7, 64bit mode, with N-Vidia geforce latest drivers, with "clasic" theme. Dual monitors- primary is standard, secondary in portrait mode. I have some lag and artifacts left on the portrait screen like in attached image.

I am running Windows 7, 64bit mode, with N-Vidia geforce latest drivers, with "clasic" theme. Dual monitors- primary is standard, secondary in portrait mode. I have some lag and artifacts left on the portrait screen like in attached image.

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Sorry, no image uploaded.

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People have been having issues with hardware acceleration. This thread discusses turning it off.

https://support.mozilla.org/en-US/questions/1075185