Add-ons: full range, and full screen (desktop like) app mode. with security permissions limitations.
There are hardly any add-ons in add-ons, and most of them creepily ask too many permissions. Some need to see some data on tabs and pages, but not all data, and sjbe don't need this at all.
Restricting permissions to what is needed, and blocking the ability to leak data out onto the network, and the ability fur users to decide if more restriction is needed, and fake data construction, and ability blocking web page and media data and decentralising as needed. Are all needed security.