Examine source code of AGK scancodes search

{
  "manifest_version": 2,
  "name": "Scancodes search",
  "version": "1.0",
  "description": "Adds a searchbar to agk 's scancodes page.",
  "content_scripts": [
    {
      "matches": [
        "*://*.appgamekit.com/documentation/guides/scancodes.htm",
        "file:///*/*/scancodes.htm"
      ],
      "js": [
        "script.js"
      ]
    }
  ]
}