A lot of people in the comment section for Firefox mentioned a new browser currently under development called Ladybird. I checked its repository, and it says: 'Ladybird is in a pre-alpha state and only suitable for use by developers.'

https://github.com/LadybirdBrowser/ladybird

PS: I don't know much about the devs or team behind it but they already seems to have a big sponsors like Cloudflare https://ladybird.org/