I use Firefox Beta on android. One can change about:config options to improve pivacy. There is something called 'encrypted client hello', which was discussed here on HN, which lets me access many blocked sites in my country.
I use the about:config options in this guide [1] plus enable encrypted DNS and encrypted client hello in about:config (on FF Beta android).
A few days ago, there was an HN page showcasing a cool webpage which can read the position angles of your phone (whether it's flat, inclined etc in detail). That page works well on regular FF Android. But on the FF Beta with the config options enabled as above prevents the page from reading the angles. I also have telemetry upload disabled on FF Beta, but maybe a bit something is still uploaded, idk.
Edit: If one trawls through some recent past threads, one can see that FF cares about privacy. They have official extensions to isolate sites (or cookies?) to prevent tracking, on desktop. (Facebook Container and Firefox Multi-Account container). They are working on something like per site isolation by default (Project Fission [2]). Yeah Chrome has it but then they try to log you into the whole browser when you just wanna log in to gmail. And they are not doing something scammy plus impactful like AMP, FLoC [3] like Google. These AMP links are everywhere, many times it looks like it's the official site link.
I had read that that's not really true, here on HN. I think the thing is that FF refuses to implement some things they think would be bad for security and privacy. They are not saying no to all PWAs. Chrome on the other hand doesn't give a damn and is trying to make the browser an OS.
Take a look at 'encrypted client hello' on FF. I'm on FF Beta android, which supports 'about:config'. Now I can access many blocked sites because of the ECH.
[1] https://news.ycombinator.com/item?id=26467749