Examine source code of Simple Tube

{
  "manifest_version": 3,
  "name": "Simple Tube",
  "version": "1.0",
  "description": "Boost productivity by hiding YouTube's recommendations, autoplay, and end screen. Toggle them back anytime.",
  "permissions": [
    "scripting"
  ],
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "host_permissions": [
    "https://www.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "youtubereccomendationhider@example.com",
      "strict_min_version": "91.0"
    }
  }
}