These are very sad news. The browser market is getting more and more dominated by Chrome. The good old days of Opera & Firefox are gone.
I have been using Vivaldi Browser for the past four years. It's the most feature-rich browser I found and the team behind it is trustworthy. Their privacy policy specifically says they do not track me or collect information on my navigation history.
But although I've not used Firefox in years, I still don't want to see it die.