Examine source code of Website Blocker

{
  "manifest_version": 2,
  "name": "Don't Get Tempted",
  "version": "1.0",
  "description": "Block websites so you don't get tempted to get inside!",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "64": "icon64.png"
  },
  "background": {
    "scripts": [
      "event.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage"
  ]
}