:has, text-indent: hanging, text-wrap: balance, iframe lazy loading, … #Firefox 121 is released today with lots of presents for web developers 🥳

https://www.mozilla.org/en-US/firefox/121.0/releasenotes/

@oblomov I don't think there's any update on those.
For RSS, it looks like there are webextensions that can fill the gap, like https://addons.mozilla.org/en-US/firefox/addon/want-my-rss/