https://gist.github.com/gregclermont/6669056 - It's being worked on. Doesn't look to be malicious at current.

I've seen someone complains about this somewhere, and it happened to me on another website, quite confusing. Thanks for https://news.ycombinator.com/item?id=6430521 explanation

https://news.ycombinator.com/item?id=6430077 - HN post/comments