Examine source code of Return YouTube Trending

{
  "manifest_version": 2,
  "name": "Return YouTube Trending",
  "version": "1.13",
  "description": "__MSG_subtitle__",
  "default_locale": "en",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icons/icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "injector.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8106811d-4b71-4a43-9f29-14fbe86e6a1b}"
    }
  }
}