[taqcp]

>What does manifest V3 add to privacy or security?

By definition, restricting the APIs extensions can use limits their power. Less powerful extensions can do fewer things, good or bad. Fewer bad things adds to privacy and security. At least that's what I understand.

Yes, I know ad blocking makes your browsing more private and secure, but that's another discussion.

[tyingq]

As far as I know, the popular ad blockers aren't reducing their permissions. They are retaining the ability, for example, to inject JS for things like "right click to block".

Manifest V3 is solely about reducing harm to Google's ad business. Full stop. Their stated reasons are very disingenuous. They knew full well how this would play out.