Examine source code of Old School YouTube™

{
  "manifest_version": 2,
  "name": "Old School Experience for YouTube™",
  "version": "2.0",
  "description": "__MSG_extensionDescription__",
  "icons": {
    "64": "icons/appico-64.svg"
  },
  "default_locale": "en",
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "src/helperFunctions.js",
        "src/observersData.js",
        "src/main.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "OldSchoolYoutube@extension.com"
    }
  }
}