Examine source code of X Original Images

{
  "manifest_version": 3,
  "name": "X Original Images",
  "description": "Redirects X/Twitter image URLs to get the best possible image quality.",
  "version": "1.0.3",
  "icons": {
    "16": "./icons/iconx16.png",
    "48": "./icons/iconx48.png",
    "128": "./icons/iconx128.png"
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "orig_redirect",
        "enabled": true,
        "path": "redirects.json"
      }
    ]
  },
  "permissions": [
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "*://pbs.twimg.com/media/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "x-original-images@twoscott"
    }
  }
}