Examine source code of Quick Page Info Copy

{
  "manifest_version": 2,
  "name": "Quick Page Info Copy",
  "version": "1.0",
  "description": "Copy the current tab's title and URL to clipboard.",
  "permissions": [
    "contextMenus",
    "clipboardWrite",
    "tabs",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "applications": {
    "gecko": {
      "id": "quick-page-info@example.com"
    }
  }
}