Examine source code of QuickIP

{
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "19": "icons/icon19.png",
      "24": "icons/icon24.png",
      "32": "icons/icon32.png",
      "38": "icons/icon38.png",
      "48": "icons/icon48.png"
    },
    "default_popup": "bubble.html",
    "default_title": "Find your IP"
  },
  "commands": {
    "quick-copy-ipv4": {
      "suggested_key": {
        "default": "Ctrl+Shift+4",
        "mac": "Command+Shift+4"
      },
      "description": "Copy IPv4 to clipboard"
    },
    "quick-copy-ipv6": {
      "suggested_key": {
        "default": "Ctrl+Shift+6",
        "mac": "Command+Shift+6"
      },
      "description": "Copy IPv6 to clipboard"
    }
  },
  "description": "Quickly find and copy your public IPv4 and IPv6 addresses",
  "icons": {
    "16": "icons/icon16.png",
    "19": "icons/icon19.png",
    "24": "icons/icon24.png",
    "32": "icons/icon32.png",
    "38": "icons/icon38.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "manifest_version": 3,
  "name": "QuickIP",
  "permissions": [
    "clipboardWrite",
    "storage"
  ],
  "host_permissions": [
    "https://*.ipify.org/",
    "https://*.ident.me/",
    "https://*.icanhazip.com/",
    "https://*.wtfismyip.com/"
  ],
  "version": "7.0.4",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56f45803-b8a1-493c-b6e2-d915306e33eb}",
      "strict_min_version": "115.0"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  }
}