Examine source code of X com disable autoplay

{
  "manifest_version": 3,
  "name": "X Autoplay Blocker",
  "version": "1.0",
  "description": "Prevents video autoplay on X (Twitter) by requiring a user click to start playback.",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg",
    "128": "icon.svg"
  },
  "host_permissions": [
    "*://*.x.com/*",
    "*://*.twitter.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.x.com/*",
        "*://*.twitter.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "x-com-disable-autoplay@urcatness",
      "strict_min_version": "120.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}