Google can see extension code, there's no way you could have used this to make an adblocker without them patching it.

You're inventing a moral dilemma here that simply doesn't exist

That's why you keep stuff like this quiet, instead of snitching to the enemy. But the vote patterns here clearly show who's trying to control the narrative.

You can either keep it quiet, im which case it's useless to the rest of us because no ad blocker would've been using it, or share it with developers, in which case I'm not sure the time it would've taken to write the exploit would've been worth it, for it to work the one or two days Google would've taken to notice and patch it.

No other decision here would have made much of a difference.