Examine source code of Synctastic

{
  "name": "Synctastic",
  "version": "1.0.3.3",
  "description": "Watch any video together anywhere!",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "dist/background.js"
    ]
  },
  "permissions": [
    "webNavigation",
    "storage",
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "all_frames": true,
      "css": [
        "content.css"
      ],
      "js": [
        "dist/content.js"
      ]
    }
  ],
  "icons": {
    "128": "images/logo3128.png"
  },
  "browser_action": {
    "default_popup": "popup/dist/index.html",
    "default_title": "Synctastic",
    "default_icon": {
      "128": "images/logo3128.png"
    }
  }
}