Examine source code of Discogs Collection Player

{
  "manifest_version": 2,
  "name": "Discogs Player",
  "version": "2.0.0",
  "description": "Play music directly from Discogs collections and marketplace listings. Seamlessly integrated YouTube player for instant music playback.",
  "permissions": [
    "https://www.discogs.com/*",
    "https://www.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.discogs.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ccfc929-de45-425f-a4f7-c7d16bf5fb91}",
      "strict_min_version": "58.0"
    }
  }
}