Oh, gosh, I'm sorry: That's Chrome add-ons. See https://chrome.google.com/webstore/detail/medium-enhanced-stats/jnomnfoenpdinfkpaaigokicgcfkomjo/support

and

https://chrome.google.com/webstore/detail/medium-distributed-in-sta/ifjjhckanopchafmmiddkkiamjkcngca