Examine source code of SpotiShush

{
  "manifest_version": 3,
  "name": "SpotiShush",
  "version": "2025.6.2",
  "default_locale": "en",
  "description": "__MSG_ext_desc__",
  "icons": {
    "16": "img/spotishush16.png",
    "48": "img/spotishush48.png",
    "128": "img/spotishush128.png"
  },
  "author": "guihkx",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5067e500-5bc8-4537-9a9a-d52cb90e37b2}",
      "strict_min_version": "121.0"
    }
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://open.spotify.com/*",
        "https://www.deezer.com/*",
        "https://app.idagio.com/*",
        "https://zvuk.com/*"
      ],
      "js": [
        "spotishush.js"
      ]
    }
  ]
}