Examine source code of Soundcloud Darker

{
  "name": "Soundcloud Darker",
  "description": "Make Soundcloud look great again!",
  "version": "5.1",
  "homepage_url": "https://scripts.9tw.de/firefox-addons/soundclouddarker",
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "icons/icon-48.png"
  },
  "background": {
    "scripts": [
      "scdarker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.soundcloud.com/*"
      ],
      "js": [
        "scdarker.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "Soundcloud Darker",
    "default_icon": "icons/moon-grey-24.png",
    "default_popup": "popup.html"
  },
  "manifest_version": 2,
  "web_accessible_resources": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1832e865-b60d-4cdb-bb27-a5071b9faf37}"
    }
  }
}