CSS nesting is enabled in Firefox 117 (currently Beta/DevEdition) 🎉
This was a bit stressful as the impact on @FirefoxDevTools was quite important and we had to change a lot of things in a lot of different places to ensure everything works with nesting.
We took this opportunity to rework how we display grouped rules, so it looks more like the CSS you authored 🙂
@nicolaschevobbe @FirefoxDevTools Nicely done!