Examine source code of Use At

{
  "manifest_version": 2,
  "name": "Use At",
  "description": "Use @ to search with multiple AI search engines",
  "version": "1.1.1",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "omnibox",
    "storage",
    "contextMenus",
    "activeTab"
  ],
  "omnibox": {
    "keyword": "@"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Use At - (@)",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://chatgpt.com/*",
        "*://grok.com/*",
        "*://www.google.com/*",
        "*://www.perplexity.ai/*",
        "*://www.phind.com/*",
        "*://x.com/*"
      ],
      "css": [
        "content-scripts/content.css"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3b409281-8b93-4dca-a011-776815cbcab0}"
    }
  }
}