Yeah on desktop. On mobile it's a lot harder. It's still turned on and you have to use a workaround to enable about: config because they don't bother to make this option visible in settings.
I don't know of any "good guys" whatsoever that ever managed to build and maintain a browser. Anyone?
Maybe one day we'll have a usable FOSS browser but I doubt it (the companies will fight tooth and nail against it including legal means, buying out companies, blocking content for them, etc.).
I think the guys that built WebKit originally (Konqueror) are kinda good guys. I still sponsor KDE with a monthly donation <3 But the browser wasn't really kept up, I don't think they had the money for it. It lives on in Safari though.
Yeah apparently you can use that to set: general.aboutConfig.enable to true
And then you can go to the normal about:config and set dom.private-attribution.submission.enabled to false
Only then is PPA actually off (apparently, I did not manage to test this yet but someone did confirm the default setting is true). Not cool. Especially because Mozilla provides instructions for the desktop version on their site but doesn't even mention the mobile version at all.
I had to go through some Gecko thing first like others mentioned, quite odd. Supposedly the setting to adjust is in there too, but I have no idea what applies here