Examine source code of More Typos Please

{
  "name": "More Typos Please",
  "manifest_version": 2,
  "version": "1.5",
  "description": "Reduce your typing performance by increasing the number of typos in your text.",
  "icons": {
    "16": "img/icon-16.png",
    "48": "img/icon-48.png",
    "128": "img/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "jquery-3.7.0.min.js",
        "contentscript.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9a6d825-6da2-4900-9b52-c24b5d25f1d8}"
    }
  }
}