On this, I definitely agree.
The point of your post on which I disagree is the idea that we need to name a "culprit".
Parent started blaming people. I certainly understand when authors don't have time or have lost interest.
Insofar I was wrong. It's not authors who are to blame, it's very vocal users. You can see a few of them right here.
When actually millions of users get a vastly superior Firefox. Many, many extensions have been updated. And some extensions – mostly niche ones haven't. I love that trade-off.