Examine source code of Udemy Speed Enhancer

{
  "manifest_version": 2,
  "name": "Udemy Speed Enhancer",
  "version": "1.0",
  "author": "Sachira Sujantha",
  "description": "Adds 2.5x and 3x playback speeds to Udemy videos.",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.udemy.com/*"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "toptrendsww@gmail.com",
      "strict_min_version": "109.0"
    }
  }
}