Examine source code of input-shortcutkey

{
  "name": "input-shortcutkey",
  "version": "0.1",
  "description": "",
  "icons": {
    "19": "icons/icon-19.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "chrome_style": true,
    "open_in_tab": true,
    "page": "options.html"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "run_at": "document_end",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/index.bundle.js"
      ]
    }
  ],
  "manifest_version": 2
}