Examine source code of Spotify Pitch Shift

{
  "name": "Spotify Pitch Shift",
  "description": "Adds a button and menu to add semi-tone pitch shift on Spotify Web Client.",
  "version": "1.0",
  "manifest_version": 3,
  "author": "matteogristina, @rnikko",
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "128": "icons/icon_128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://open.spotify.com/*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "https://open.spotify.com/*"
      ],
      "resources": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@spotify-pitch-shift",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "140.0"
    }
  }
}