Examine source code of True Verified

{
  "manifest_version": 2,
  "name": "True Verified",
  "version": "1.0",
  "description": "Grays-out Twitter verified checkmarks of Twitter Blue users.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "hider.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "true-verified@codingpa.ws"
    }
  }
}