Examine source code of X Username Blur

{
  "manifest_version": 2,
  "name": "X Username Blur",
  "version": "1.0",
  "description": "Toggle blur on your X username in the bottom-left sidebar for privacy.",
  "permissions": [
    "*://x.com/*",
    "*://twitter.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://x.com/*",
        "*://twitter.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "x-username-blur@extension",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}