Examine source code of mute-spotify-ads

{
  "manifest_version": 2,
  "name": "mute-spotify",
  "version": "1.0",
  "content_scripts": [
    {
      "matches": [
        "https://open.spotify.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}