Examine source code of Popout Tab

{
  "manifest_version": 2,
  "name": "Popout Tab",
  "description": "Popout a tab into its own self-contained window.",
  "version": "1.1.0",
  "icons": {
    "32": "assets/icon32.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "assets/icon32.png"
  },
  "commands": {
    "toggle_popout": {
      "description": "Popout current tab",
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      }
    }
  },
  "permissions": [
    "contextMenus"
  ]
}