Examine source code of Deezer-QOL

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Deezer-QOL",
  "content_scripts": [
    {
      "matches": [
        "*://*.deezer.com/*"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c9584efd-c620-4851-b35e-43bad6180966}"
    }
  }
}