The vast majority of users are not extension developers. I'd not heard of this issue until now. It sucks, but it wouldn't make me decide to stop using the browser.
You're not looking at the full picture. Mozilla's pure incompetence to even maintain their addons ecosystem. Remember when all live addons failed due to a cert failure? Besides dumbing down the browser now they can't even seem to get addons running smoothly. Extensions/addons are a core part of a modern browser.
Yes, this kind of thing just shouldn't happen after the "sudden global outage of all add-ons [incl. privacy ones]", followed "no, no, don't worry guys, we forced out a fix via a secret backdoor!"
I remember when all my privacy extensions were entirely absent and I accidentally surfed the web. I felt so vulnerable after that, as if I surfed the web bareback