There has been a warning about sync 3rd party scripts injected with document.write for quite a while now..
The initial plan is to execute this intervention when we detect the criteria being met. We started with showing just a warning in the Developer Console in Chrome 53. (Beta was in July 2016. We expect Stable to be available for all users in September 2016.)
Publish this update to Hacker News on the same day (and ideally, the same time) each month. It will not take too long before every dev in the world will be eagerly awaiting your update.
The key is consistency. If you publish this update 100% reliably (Neither snow nor rain nor heat nor gloom of night...), then it will become the go-to way of hearing about browser issues.
Extra Credit - Get your friends at Mozilla, Microsoft, Apple, etc. to contribute to the update for their respective browsers. If there was one place where ALL browser updates were documented, you will change the world.