I've noticed that after watching YouTube on any speed greater than 1x starts to consume more and more memory on my system which does not go away until a restart occurs. This is repeatable and occurs when in private mode without any extensions enabled. I've done this on Chrome with the same extensions enabled as well as a fresh Edge and this problem does not occur. I am running Windows 10 Home Version 19043. The leaked memory gets put into Desktop Window Manager when viewed in task manager, but I have isolated it to Firefox by launching in safe mode without any other programs running and seeing the lead occur as soon as I start viewing a YouTube video at faster speeds.