Well, there was the DNS-over-HTTPS thing and the Mr. Robot thing, and the Pocket thing and ... they're not perfect.
However, I've been using Firefox as my primary browser for about five years and have been very happy with it -- especially post Quantum. I can't even remember the last time I've had to switch to Chromium because something wasn't working.
I am personally a fan of the DNS-Over-HTTPS experiment,I think it has a lot of benefits and hope it becomes standard.
The pocket thing isn't that bad, it's legitimately just a free cloud sync bookmarking service that you can use, or not. It's basically an extension of FF Sync, and no one has problems with that.
The Mr Robot plugin catastrophe was abhorrent, I certainly won't deny that.
However, I've been using Firefox as my primary browser for about five years and have been very happy with it -- especially post Quantum. I can't even remember the last time I've had to switch to Chromium because something wasn't working.