Examine source code of TalkGPT

{
  "manifest_version": 2,
  "name": "TalkGPT",
  "version": "1.0.5",
  "description": "Sets TalkGPT.com as the default search engine for Firefox address bar searches",
  "permissions": [
    "storage",
    "https://talkgpt.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://talkgpt.com/*"
      ],
      "js": [
        "detect-extension.js"
      ],
      "run_at": "document_start"
    }
  ],
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "TalkGPT.com",
      "keyword": "talkgpt.com",
      "search_url": "https://talkgpt.com/?terms={searchTerms}&utm_source=firefox-extension&utm_campaign=default-search",
      "favicon_url": "https://talkgpt.com/favicon.ico",
      "encoding": "UTF-8",
      "is_default": true
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "talkgpt-default@talkgpt.com"
    }
  }
}