Examine source code of X Nitter Redirect

{
  "manifest_version": 3,
  "name": "X Nitter Redirect",
  "description": "Redirects X (Formerlly Twitter) to Nitter or other website you want",
  "homepage_url": "https://github.com/agostaxyz/xredirect",
  "version": "1.2.3",
  "browser_specific_settings": {
    "gecko": {
      "id": "xredirect@agostaxyz",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "32": "assets/icon-32.png",
    "48": "assets/icon-48.png",
    "128": "assets/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_icon": "assets/icon-32.png",
    "default_title": "X Redirect Settings",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://x.com/*",
        "*://www.x.com/*",
        "*://mobile.x.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "content-script.js"
      ],
      "run_at": "document_start"
    }
  ]
}