When I watch videos on Youtube, suddenly it says I can only watch them in 360p or 720p quality, when previously I had access to 4K and 8K video at maximum and 1080p average. Youtube says "YouTube videos are available in many formats and qualities. But, some browsers do not support newer video formats or quality options. This restriction means these browsers may only have one or two video formats to choose from. We recommend upgrading your browser or operating system for the best viewing experience." This has only happened now and it only happens with Firefox, as when watching videos with Safari 1080p video is available. I am using the latest version of Firefox on a Mac mini with the latest Mac OS installed.