Recently I've had this issue (on reddit) where after I expand a video in the feed, and start scrolling, all the visuals freeze. I know it's only the visuals, because I can still interact with the website (usually unexpand the video, or pause it) with the image still frozen and audio still playing. I can fix it by tabbing firefox down, and then up again. While researching I found the profiler, and finally managed to capture the moment it happened. I'm no stranger to technical stuff but it's a loooot of data to process, I did a "clean" profile recording as well where I did the same action and where it didn't freeze, and I can't really make heads or tails out of what the issue is. The recording managed to capture the phenomenon and I only clicked twice during that period, to expand two reddit expando videos, the second one is what caused the issue when scrolling. The only thing I see is a spike in memory usage Not sure if I can (or should) upload the profile recording here or what, but it's been bugging me a lot. It's pretty tricky to replicate because it seems to be random when and what triggers it, even expanding the same videos doesn't replicate it. Sometimes I go days without it happening, sometimes it happens 6 times in a single session. I've added some screenshots of various views of the profiler/stack data. I have an Nvidia RTX 5070ti GPU, hardware acceleration is on, AMD Ryzen 7 9800X3D processor. I think I might have enabled some rendering settings in about:config, maybe it's related to that but I don't remember exactly what. Maybe it's due to some windows "game optimisation" or the GPU and CPU-GPU fighting? I have no problems watching videos while playing games or anything though.