Examine source code of randumb — coherent fake data form filler

{
  "manifest_version": 3,
  "name": "randumb — coherent fake data form filler",
  "short_name": "randumb",
  "version": "1.0.3",
  "description": "Form filler with 58 locales and country-coherent identities (Germany→Hans Müller→München→€). Bulk CSV for test DBs. Free.",
  "homepage_url": "https://voiddo.com/tools/randumb/",
  "author": "vøiddo",
  "browser_specific_settings": {
    "gecko": {
      "id": "randumb@voiddo.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_title": "randumb — fill form (Alt+Shift+F)",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "service-worker.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "pages/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "storage",
    "alarms",
    "contextMenus",
    "downloads",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "commands": {
    "fill-form": {
      "suggested_key": {
        "default": "Alt+Shift+F",
        "mac": "Alt+Shift+F"
      },
      "description": "Fill the current form with random data"
    }
  }
}