For about one month (June, 2023) or more, updated Firefox for Windows 10 cannot play YouTube videos or videos on other website without being in Troubleshoot mode. Google… (read more)
For about one month (June, 2023) or more, updated Firefox for Windows 10 cannot play YouTube videos or videos on other website without being in Troubleshoot mode. Google Chrome has no problem with the same videos, and Firefox for Android also plays them. All help suggestions have been followed, including Refreshing Firefox, disabling some and all hardware acceleration, etc. Troubleshoot mode does not identify what was disabled (themes, extensions, etc.), but there are very few of such anyway, and Refresh did not resolve the issue. VPN was also disabled to see if that made any difference, but it did not. When the videos are attempted, the audio and progress bar work, but video is black. Scrolling with the progress bar reveals all images from the video one at a time, but PLAY does not enable the video, just audio.