Examine source code of fanlights.io

{
  "manifest_version": 3,
  "name": "fanlights.io-gecko",
  "description": "Adds the latest high-bitrate MLB video content to Yahoo Fantasy Baseball",
  "version": "3.0.3",
  "options_ui": {
    "page": "options.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "options.html",
        "carousel.html",
        "carouselFrame.html",
        "/icons/*"
      ],
      "matches": [
        "*://baseball.fantasysports.yahoo.com/*"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "icons": {
    "48": "/icons/icon-48.png",
    "128": "/icons/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://baseball.fantasysports.yahoo.com/b1/*",
        "https://mlb-cuts-diamond.mlb.com/FORGE/*",
        "https://milb-cuts-diamond.mlb.com/FORGE/*",
        "https://bdata-producedclips.mlb.com/*",
        "https://darkroom-clips.mlb.com/*"
      ],
      "js": [
        "/libs/purify.min.js",
        "/libs/jquery-3.5.1.min.js",
        "helpers.js",
        "carousel.js",
        "/platforms/yahoo.js",
        "content.js"
      ],
      "css": [
        "carousel.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "serviceWorker.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fanlights@fanlights.io"
    }
  }
}