Examine source code of Unchecker

{
  "description": "Simple extension letting you uncheck all checkboxes on a page.",
  "manifest_version": 3,
  "name": "unchecker",
  "version": "1.2.2",
  "author": "Ad5001",
  "developer": {
    "name": "Ad5001",
    "url": "https://ad5001.eu"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "unchecker@ad5001.eu",
      "strict_min_version": "113.0"
    },
    "gecko_android": {
      "strict_min_version": "113.0"
    }
  },
  "homepage_url": "https://apps.ad5001.eu/unchecker/",
  "background": {
    "scripts": [
      "uncheck.js",
      "clickall.js"
    ]
  },
  "action": {
    "default_icon": "icons/on.svg",
    "default_title": "Uncheck all checkboxes"
  },
  "icons": {
    "48": "icons/off.svg",
    "96": "icons/off.svg"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "menus",
    "scripting"
  ]
}