> How do you like extensions to notify of new features?

No notifications at all.

Yes, I understand that it is a conflict of interest between me and whoever writes software.

Optionally, notification in some central standard system of notifications that people hating notifications can silence (not sure is such system existing - if it exists I silenced it long time ago). This would work fine as notifications-haters can disable them and vast majority of people will continue to get them.