Examine source code of FUTMind

{
  "description": "The extension FUT Mind can import your FUT club and keeps track of the pack opened on the FUT Webapp.",
  "version": "2.1.7",
  "manifest_version": 3,
  "name": "FUTMind - Club import",
  "action": {
    "default_title": "FUTMind - Club import and Packs tracker",
    "default_popup": "popup.html"
  },
  "icons": {
    "32": "src/assets/img/icon_dark_32.png",
    "48": "src/assets/img/icon_dark_48.png",
    "64": "src/assets/img/icon_dark_64.png",
    "128": "src/assets/img/icon_dark_128.png",
    "512": "src/assets/img/icon_dark_512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.easports.com/*ea-sports-fc/ultimate-team/web-app/*",
        "*://www.ea.com/ea-sports-fc/ultimate-team/web-app/*",
        "*://www.ea.com/*ea-sports-fc/ultimate-team/web-app/*"
      ],
      "js": [
        "contentScript.bundle.js"
      ],
      "css": [
        "content.styles.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "inject.bundle.js"
      ],
      "matches": [
        "*://www.ea.com/*"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'",
    "sandbox": "sandbox allow-scripts; script-src 'self' 'https://apis.google.com/' 'https://www.gstatic.com/' 'https://*.firebaseio.com' 'https://www.googleapis.com' 'https://ajax.googleapis.com'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{da288fb7-04b7-4486-bf69-e6229152d724}",
      "strict_min_version": "58.0"
    }
  }
}