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Firefox turns black every now and then

Firefox Súbory PDF
seschu1
seschu1

Hi, Firefox is hard to use for me right now. The screen turns sometimes black while using the browser. Especially when opening pdf documents in Firefox the screen turns black before the document opens. Also, after switching to another tab or App the pdf is not visible anymore and also black (see sreenshot). I have tried reinstalling Firefox and also start in troubleshoot mode. What is the issue??

Thanks.

Sebastian

Hi, Firefox is hard to use for me right now. The screen turns sometimes black while using the browser. Especially when opening pdf documents in Firefox the screen turns black before the document opens. Also, after switching to another tab or App the pdf is not visible anymore and also black (see sreenshot). I have tried reinstalling Firefox and also start in troubleshoot mode. What is the issue?? Thanks. Sebastian
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