[wtallis]

> 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?

Is there a security argument for this change? I must have overlooked it.

As for performance: users have a choice about what extensions they use. If Google sincerely believes that their proposed limited content blocking API is adequate, then they can expect that users will notice the performance advantage and move to a new ad blocker even if the old API remains present. That's the main mechanism by which uBlock Origin has largely replaced AdBlock Plus.

On the other hand, in the (fairly likely) case that we find out the new ad blocking API doesn't allow for very thorough blocking, and the ads that make it through slow things down more than our current generation of full-featured blockers, then the lower overhead of the new API really doesn't help end users in any meaningful way.