Firefox is at ~3% market share now. Mozilla lost a full point over the last year. https://gs.statcounter.com/browser-market-share
That said, I'm bummed out that E2EE using insertable streams / SFrame transform is only currently supported in Chrome.
I've also noticed that very few devs in the WebRTC community actually test stuff in Firefox.
It should have a higher share. Microsofts anticompetitive “Firefox might be malware” pop ups are absurdly destructive