Examine source code of YouTube Tracks

{
  "manifest_version": 2,
  "name": "YouTube Tracks",
  "description": "YouTube tracklist navigation.",
  "version": "1.2.2resigned1",
  "applications": {
    "gecko": {
      "id": "youtube-tracks@ris58h"
    }
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "settings.js",
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ]
}