I’ve been having an issue recently where videos do not seem to load. I will hit play and it will just spin and spin, but the video never plays. Attempting to close the tab or browser causes a total freeze of firefox (uninteractable, eventually greys out the window). Originally this was just an issue with youtube, and it did go away, but now It’s happening with reddit’s videos as well. Any ideas?
Try temporarily disabling any Firefox Addons you have, and see if the issue persists. If the issue is gone, you might then try to pin-point which specific addon is causing the issue, and address it there.