Examine source code of Skribbl QoL

{
  "manifest_version": 2,
  "name": "Skribbl Qol",
  "version": "2.0",
  "description": "Adds a bunch of Qualities of life to skribbl",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://skribbl.io/*",
        "https://skribbl.io/"
      ],
      "js": [
        "index.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{85754f63-23d5-4c5f-a408-50d8134fcb44}"
    }
  }
}