Mozilla is going on the completely opposite direction of what their supporters (and previous contributors) want them to go.
Yes, they provide mobile browsers, plus a browser with "private mode" (focus) and now this. But on every single one of them, you have the same philosophy of Google Chrome (tm) adopted, of treating the user as a dumb gullible person that should not have access to important settings.
Why would they waste so much effort, and clone all the things people should avoid from Google Chrome?!
For example, any new tech introduced that can be used for browser fingerprinting and user tracking (e.g. canvas, webgl, webrtc, etc) is enabled to every single site by default, just like chrome.
Some you can install extensions (you can't on this and on mozilla focus), some you can fiddle with user-UNfriendly settings in about:config (desktop and full featured android, not focus or this) where you have to guess setting names and cryptic values (what does 2 means in a setting named somethingEnabled?!)
Only on mozilla desktop you can standardize sane settings by importing a user.js file from the dozen of crowdsourced efforts (i recommend the most complete one from https://github.com/pyllyukko/user.js/ ). think about this, there's more then a dozen community led effort to provide sane defaults, not hardcore user optimized settings, sane defaults, for a project that should be open source and the users could have been able to send in patches to have sane defaults in the first place! now, why would those sane defaults everyone want would be denied in the main branch? because mozilla do not represent the users for a long time!
Mozilla is now a corporation that looks for Advertisement companies grants.