Examine source code of Suggestie Butler

{
  "name": "Suggestie Butler",
  "description": "Suggesties voor CUE op basis van Artikel",
  "version": "3.0.9",
  "manifest_version": 3,
  "icons": {
    "16": "images/icon-16x16.png",
    "32": "images/icon-32x32.png",
    "48": "images/icon-48x48.png",
    "128": "images/icon-128x128.png"
  },
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "action": {
    "default_icons": {
      "16": "images/icon-16x16.png",
      "32": "images/icon-32x32.png",
      "48": "images/icon-48x48.png",
      "128": "images/icon-128x128.png"
    }
  },
  "permissions": [
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://ndc-test-cue.bluebillywig.com/*",
    "https://cue-test.ndcnet.nl/*",
    "https://cue2.ndcnet.nl/*",
    "https://cue.ndcnet.nl/*",
    "https://cuetestaws.ndcnet.nl/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "butler@mediahuis.nl",
      "strict_min_version": "109.0"
    }
  }
}