No more videos on whole pc till restart nightly. I did install the whole PC new. It's just like before and its . . . . awfull But when closing the black-screened tab with video, i can see the stream - it's running - but it's black for me after 10 min. or so . . . . Today made a test with disabled Adguard and videodownloadhelper. no crashes. Then started bandicam, no crashes. At the end i can't have figured out, what problem this is but no videos in windows through VLC means it do come from firefox?