Not sure when it started, but for the past few months, any video I watch on youtube or netflix has a ludicrous amount of dropped frames (anywhere from 30-90% drop rate), and I have no clue how to fix it, the most common answers I've found are are things like toggling Hardware Acceleration or "media.mediasource.webm.enabled", empty the cache, check internet connection, and so on, but nothing's worked. But videos on Dailymotion play fine, and when I load youtube in Microsoft Edge, the video runs smoothly.