Examine source code of KeyCode

{
  "manifest_version": 2,
  "name": "KeyCode",
  "version": "1.1.2",
  "description": "Press any key to see its keyCode code and key properties",
  "browser_specific_settings": {
    "gecko": {
      "id": "{dfbbf494-8d47-4a59-bc23-b8f4be928ca5}",
      "strict_min_version": "96.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "gfx/ic16.png",
    "48": "gfx/ic48.png"
  },
  "browser_action": {
    "default_popup": "front/app.html",
    "default_icon": {
      "16": "gfx/ic16.png",
      "48": "gfx/ic48.png"
    }
  },
  "background": {
    "scripts": [
      "back/daemon.js"
    ]
  },
  "permissions": []
}