Examine source code of YouTube™ Time Tracker

{
  "manifest_version": 2,
  "name": "YouTube™ Time Tracker",
  "description": "Open source, privacy first extension that tracks time you spent watching YouTube™",
  "short_name": "YTimeTracker",
  "version": "0.12resigned1",
  "author": "Anatoli Makarevich",
  "icons": {
    "128": "extension_icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "app.js"
      ],
      "css": [
        "app.css"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "https://www.youtube.com/",
    "storage"
  ],
  "web_accessible_resources": [
    "styles/style.css",
    "img/stopwatch.svg",
    "img/stopwatch_white.svg",
    "img/thumbs_up.svg",
    "img/red_triangle.svg",
    "img/green_triangle.svg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d156fbf4-06f4-41db-b280-eabe7999c90b}"
    }
  }
}