Honestly those are more like gimmicks from an advanced user standpoint as the I still don't care about cookies extension does the job just fine as far as I'm concerned, and while this may indeed make a good headline or feature I think development may lack emphasis on the core of firefox and what makes it a good browser.

There is much more fundamental and core functionality missing which has been requested for years like this for example https://bugzilla.mozilla.org/show_bug.cgi?id=1325692

In general it would be good having such functionality built-in, I guess they're gonna have to maintain it as well.

All and all, I'm glad to see any kind of progress on the browser and in any case wish them the very best.