Examine source code of Perplexity Model Selector

{
  "manifest_version": 2,
  "name": "Perplexity Model Selector",
  "version": "1.0.8",
  "description": "Injects AI model selection dropdowns into Perplexity UI",
  "permissions": [
    "*://www.perplexity.ai/*",
    "webRequest"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.perplexity.ai/*"
      ],
      "js": [
        "content_script.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{87b5164a-ac81-4a5f-9f9e-145c878ecfdc}"
    }
  }
}