I guess I don't really understand this. Even without the old extension apis, it's still more powerful than anything Chrome has to offer. You don't get the access you want, so you go to something with even less access?
I had some useful extensions that worked with old Firefox. Then new Firefox came along and killed off some of them, so I had even fewer useful extensions. Meanwhile, Chrome has many more useful extensions and hasn't killed off any of them. Chrome fits my workflow, Firefox doesn't/can't. Yet this is somehow understood as me wanting 'less'. ¯\_(ツ)_/¯