Examine source code of vt-url-scanner

{
  "description": "Adds browser action icon to toolbar to scan current active tab URL.",
  "manifest_version": 2,
  "name": "vt-url-scanner",
  "version": "1.2",
  "homepage_url": "https://github.com/jaemsz/Web-Extensions/tree/main/vt-url-scanner",
  "icons": {
    "48": "icons/vt-48.jpg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/vt-32.jpg"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "tabs",
    "downloads",
    "storage",
    "<all_urls>"
  ]
}