Firefox 121 Posted by N19PEDL2 on Tuesday December 19, 2023 @09:49AM from the mozilla.org dept. https://www.mozilla.org/en-US/firefox/121.0/releasenotes/ ( 4 comments | 33 points | on HN )
https://www.mozilla.org/en-US/security/advisories/mfsa2023-5...
AFAIK, there hasn't really been a roadmap for it, meanwhile a lot of people are already using them since they've become standard in Chrome.