Google Chrome activating Mac webcam When I open Google Chrome app, my webcam seemingly starts recording, i.e. green light next to iSight lightens. What is happening?

Edit: I went to System Preferences -> Sharing and saw that everything is turned off. Then I went to Activity Monitor and searched for "camera" saw some process which I killed then and the light turned off.

After restarting Google Chrome app, camera again turns on.
There are two most likely reasons for this:


One of the installed Chrome extensions is accessing the camera. 
You have tabs to websites opening automatically which access the camera


In both cases, a bit trial and error is required to identify the cause.