Examine source code of ReTwitterify

{
  "manifest_version": 2,
  "name": "ReTwitterify",
  "version": "1.2.0",
  "description": "Turns X back to Twitter.",
  "author": "Xenoreaper",
  "icons": {
    "48": "icons/ReTwitterify.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*",
        "*://*.x.com/*"
      ],
      "js": [
        "retwitterify.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8a363df9-5a58-4b34-8a11-f3b144805271}"
    }
  }
}