Examine source code of Rabbit Hole

{
  "manifest_version": 2,
  "name": "Rabbit Hole",
  "version": "1.3.1",
  "description": "An Extension to trace your Wikipedia Journeys",
  "background": {
    "scripts": [
      "js/browser-polyfill.js",
      "js/background.js"
    ]
  },
  "permissions": [
    "storage",
    "webNavigation",
    "tabs"
  ],
  "browser_action": {
    "default_title": "Rabbit Hole"
  },
  "icons": {
    "48": "assets/icon-48.png",
    "96": "assets/icon-96.png",
    "128": "assets/icon-128.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{fc964c4a-26b1-4f8d-8cdc-cfad6fa1ed2d}"
    }
  }
}