Examine source code of Kobold

{
  "manifest_version": 2,
  "name": "Kobold",
  "version": "1.0",
  "description": "Easily download videos from YouTube using Cobalt",
  "icons": {
    "100": "guy.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "guy.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1fd69438-af01-4eb7-b669-d4bde49bab79}"
    }
  }
}