Social Network Blocker Chrome Extension #0

Github repo: https://github.com/HansNewbie/Social-Chrome-Extension

This idea actually came up a while ago for a school project (that is still ongoing). The idea was to make a counter for how long have you spend on social network. Now I am making it into a personal project. Since I am still new to JavaScript and I would like to avoid making the time counter, I am making instead a blocker which would close the Chrome Tab if it is read as a registered social network (now I am trying to make it work for Facebook first). I am facing difficulties due to the unknown territory I am in (new in JavaScript and using chrome API).