Examine source code of Joplin Search Integration

{
  "manifest_version": 2,
  "name": "Joplin Search Integration",
  "description": "Displays Joplin notes in search results on Google, Bing, and other engines, integrating personal notes with web searches.",
  "version": "0.12.4",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "http://localhost:27583/*",
    "http://localhost:41184/*"
  ],
  "omnibox": {
    "keyword": "@joplin"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://cn.bing.com/*",
        "https://duckduckgo.com/*",
        "https://search.brave.com/*",
        "https://www.baidu.com/*",
        "https://www.bing.com/*",
        "https://www.google.cn/*",
        "https://www.google.co.jp/*",
        "https://www.google.co.uk/*",
        "https://www.google.com.au/*",
        "https://www.google.com.hk/*",
        "https://www.google.com/*",
        "https://www.google.de/*",
        "https://www.google.es/*",
        "https://www.google.fr/*",
        "https://www.google.it/*",
        "https://www.google.ru/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "content-scripts/content.css"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{77acd154-9528-47d8-b340-dbd61729064d}"
    }
  }
}