Stop!
This is a browser feature intended for developers. If someone told you to copy-paste something here to enable a Facebook feature or “hack” someone’s account, it is a scam and will give them access to your Facebook account.
For more information, see https://www.facebook.com/selfxss.
4 replies on “Facebook JavaScript Console Warning”
Next thing you know, browser vender will remove the console 🙁
Now that would be a pain.
There’s an explanation of how this works on Stack Overflow
“The Chrome team decided that defeating the console from user-side JS was a bug” 🙂