"#Firefox on the brink… The Big Three may effectively be down to a Big Two, and right quick."
https://www.brycewray.com/posts/2023/11/firefox-brink/
This is based on a guideline for developers of U.S. government websites, putting Firefox at near a 2% cutoff point.
#Chrome 49%
#Safari 34.8%
#Edge 8.4%
Firefox 2.2%
via @BryceWrayTX