Examine source code of Easy Notes

{
  "name" : "Easy Notes",
  "version" : "1.0.0",
  "minimum_chrome_version" : "46",
  "description" : "A simple note taking cum To-Do list add-on that will keep you productive throughout the day! And also, never worry about privacy anymore as everything you input is stored in your local storage only!",
  "icons" : {
    "128" : "icon_128.png"
  },
  "browser_action" : {
    "default_title" : "Stay Productive",
    "default_popup" : "popup.html"
  },
  "manifest_version" : 2 
}