Examine source code of Bitculator

{
  "manifest_version": 3,
  "name": "Bitculator",
  "version": "1.1",
  "description": "Quick access to Bitculator tools: converter, assets, wallets, and more.",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "id@bitculator.com",
      "strict_min_version": "109.0"
    }
  },
  "permissions": []
}