Examine source code of X → FixVx Link Copier

{
  "manifest_version": 2,
  "name": "X → FixVx Link Copier",
  "description": "Automatically rewrites copied X/Twitter links to fixvx.com (no ads, no tracking, no login walls).",
  "version": "1.2",
  "icons": {
    "128": "icon.png"
  },
  "permissions": [
    "clipboardWrite",
    "*://x.com/*",
    "*://twitter.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://x.com/*",
        "*://twitter.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "x-to-fixvx@account.com",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}