Examine source code of Hostname Copier

{
  "manifest_version": 2,
  "name": "Hostname Copier",
  "version": "0.5.0",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{4178160e-dcb2-43ca-9f61-f6da3572d69d}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "theme"
  ],
  "browser_action": {
    "default_title": "Copy Hostname",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+H",
        "mac": "Alt+Shift+H"
      },
      "description": "Copy the hostname of the current tab"
    }
  }
}