Examine source code of Eurocontrol NES

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Eurocontrol NES",
  "description": "Eurocontrol NES",
  "icons": {
    "16": "images/icon-16.png",
    "48": "images/icon-48.png"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "omnibox": {
    "keyword": "nes"
  },
  "browser_action": {
    "default_title": "Open Eurocontrol NES",
    "default_icon": {
      "16": "images/icon-16.png",
      "48": "images/icon-48.png"
    },
    "url": "https://b2c.nes.nm.eurocontrol.int",
    "query": {
      "title": "NES*"
    }
  },
  "background": {
    "scripts": [
      "background/PortManager.js",
      "background_script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.eurocontrol.int/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  }
}