[flyingshelf]

> the new owner can't spy on my viewing

Quick question: how do you distinguish content blocker extensions from regular extensions? All the Adblockers I know have to use both to be effective at hiding ads, especially on YouTube.

In that case, the new owner can still do the spying.

[fizwidget]

In iOS at least, it tells you in Settings > Safari > Extensions. E.g. if I tap into one of the AdGuard ones I see:

“"AdGuard — General" does not have permission to read or transmit content from any web pages.”

Ones that have more permissions will say so.