Hola (VPN)
Momentum (Makes the 'new tab' page really pretty and tells you the time)
Screencastify (records your screen and in-screen audio recording)
Hangouts
Grammarly (useful if you want correct spelling/grammar for posts)
Chrome NotePad (So useful)
Adblock
Panic Button (one click and all your tabs dissapear until you click the button again, useful if you live with your parents
)