Examine source code of Garrett's DNS Extension

{
  "manifest_version": 2,
  "name": "Garrett's DNS Extension",
  "version": "4.9",
  "description": "Allows you to quickly view and copy the host and IP for any site you are visiting, your own IP, and even randomly generated passwords. The extension contains links for screenshots, DNS records, geolocation details, whois info, reverse IP lookup, ping servers, url shortening, and cachebusting for any site you are viewing.",
  "options_ui": {
    "page": "/pgs/options.html"
  },
  "icons": {
    "48": "/img/icon-48.png",
    "128": "/img/icon-128.png"
  },
  "browser_action": {
    "default_icon": "/img/icon-128.png",
    "default_popup": "/pgs/popup.html"
  },
  "permissions": [
    "tabs"
  ],
  "content_scripts": [
    {
      "js": [
        "/inc/jquery.js",
        "/inc/script.js"
      ],
      "css": [
        "/inc/style.css"
      ],
      "matches": [
        "*://*/*"
      ],
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fbf5b6bc-cc81-4aac-a7a9-e7b9dbf5b091}"
    }
  }
}