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Videos break, but only after FF is open for a while

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Videos work great when I just open FF or after I restart FF. But after FF is open for a while, all I get when playing videos is perfect audio with a black image instead of video for both Netflix and Youtube. This is very consistent and a major daily issue.

Hardware acceleration is off, drivers are up to date, I cannot easily test for addons because of the time required and how vital my addons are to my internet experience, my computer has run a memory diagnostic and come up empty, and none of my addons should ever affect Netflix. I had zero video issues prior to Firefox Quantum that could not be solved by disabling hardware acceleration.

Videos work great when I just open FF or after I restart FF. But after FF is open for a while, all I get when playing videos is perfect audio with a black image instead of video for both Netflix and Youtube. This is very consistent and a major daily issue. Hardware acceleration is off, drivers are up to date, I cannot easily test for addons because of the time required and how vital my addons are to my internet experience, my computer has run a memory diagnostic and come up empty, and none of my addons should ever affect Netflix. I had zero video issues prior to Firefox Quantum that could not be solved by disabling hardware acceleration.

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Update your Video Card Drivers.

Check here : Go to the Firefox 3 Bar Menu --> Help ? --> Troubleshooting Information Page and take a look in the Accessibility section if accessibility is set to "true" there. if yes, go to the Firefox 3 Bar Menu --> Options --> Privacy & Security panel and under Permissions check the setting to Prevent Accessibility Services from accessing your browser.

Please let us know if this solved your issue or if need further assistance.

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Drivers are up to date, which I checked a couple days ago. I disabled accessibility services a few days ago. So unfortunately this advice does not help me.