100% agree.
If its not open source 1) you can’t fully trust/audit. and 2) you’ll be left in the dust should the company cease to exist as nobody can continue development.
If Firefox is not private enough use Librewolf. If you’re interested in something new and exciting give Zen Browser or Floorp (both based on Firefox) a spin.
Thoroughly dismantling America. Sad day for Americans, exactly what Putin ordered.