[elsjaako]

> what would it take to convince you that this change really is being made for performance and security reasons, and not to hurt ad blocking?

It's a fair question, but there are several of things that would at least help convince me.

They could demonstrate that they have tried all other solutions that would solve the security issue.

They could demonstrate that the performance benefits of the change would be bigger than the performance benefits of ad blocking.

They could implement a more performant/secure API that still allows full ad blocking.

They could build ad-blocking into chrome (doesn't seem likely to me, but it would convince me).