Examine source code of Shodan

{
  "name": "Shodan",
  "version": "1.1.1",
  "manifest_version": 2,
  "description": "The Shodan plugin tells you where the website is hosted (country, city), who owns the IP and what other services/ ports are open.",
  "icons": {
    "16": "img/16x16.png",
    "48": "img/48x48.png",
    "128": "img/128x128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "img/19x19.png",
      "38": "img/38x38.png"
    },
    "default_title": "Shodan",
    "default_popup": "html/popup.html"
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "https://api.shodan.io/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox-extension@shodan.io"
    }
  }
}