FF 138 has HDR support https://www.reddit.com/r/linux_gaming/comments/1jp6njd/hdr_in_firefox_now_works/

Run a browser on wine, they are likely detecting from widevine itself. Or try this tutorial: https://thebrokenrail.com/2022/12/31/xfinity-stream-on-linux.html

https://nitter.net/omgubuntu/status/1574759306544701443 https://www.omgubuntu.co.uk/2022/10/ubuntu-pro-terminal-ad The advertised product is literally free under certain conditions so I don’t consider this offending.