Earlier quoted context omitted.
Mozilla doesn't create all those extensions. And the extensions' authors had, what, two years advance warning or so? Criticize the real culpits, not Mozilla.
Look at this from a user perspective: The user diligently updates Firefox, optimistically hoping that this new version will be as awesome as the previous ones that vastly improved performance. Firefox starts and, suddenly, a bunch of things that used to work stop working. Why? Well, essentially, something that they can't hope to comprehend and that they never asked for and had no input on just ruined their browser. W…
That was already happening, where "this shit" was crippling performance issues, and a lack of sandboxing and modern security features.
I expect Mozilla believed that the user fallout from breaking some extensions would be less than the existing continuing fallout of the ongoing issues.
> Mozilla should've tried to smooth this transition, not just simply pull the pin on the web extensions grenade and yell "Catch!".
You do realize that this transition has been going on and has been publicized for years, right?