Examine source code of Quick Social Navigation

{
  "browser_action": {
    "default_icon": "icon16.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "*://*.facebook.com/*",
    "*://*.i7con.net/*",
    "*://*.instagram.com/*",
    "*://*.twitter.com/*",
    "cookies",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "webNavigation",
    "http://*/*",
    "https://*/*"
  ],
  "description": "Navigation menu for your social media website. ",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "page": "background.html",
    "persistent": true
  },
  "manifest_version": 2,
  "name": "Quick Social Navigation",
  "version": "1.0",
  "web_accessible_resources": [
    "img/*.png"
  ]
}