Examine source code of Quick Karaoke Mode

{
  "manifest_version": 2,
  "name": "Quick Karaoke Mode",
  "version": "1.3",
  "description": "Enable karaoke mode for online videos by reducing vocals and controlling playback.",
  "permissions": [
    "activeTab",
    "tabs",
    "storage"
  ],
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/logo_32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@Quick-Karaoke-Mode",
      "data_collection_permissions": {
        "required": [
          "locationInfo"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  }
}