This is one of the best additions to the Web Platform as of late IMHO. Great if you run an operation with a lot of third party code coming in from sources that

This is one of the best additions to the Web Platform as of late IMHO. Great if you run an operation with a lot of third party code coming in from sources that you don't control - even beyond the security concerns for just "keeping them honest" about the scripts they run on your page. I hope it gets adopted by all browser vendors soon.