Examine source code of RTT Mapper

{
  "name": "RTT Mapper",
  "version": "0.6.0.0",
  "description": "Adds mapping functionality to RealtimeTrains.co.uk",
  "manifest_version": 2,
  "permissions": [],
  "icons": {
    "16": "img/icon/16x16.png",
    "48": "img/icon/48x48.png",
    "128": "img/icon/128x128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.realtimetrains.co.uk/service/*",
        "https://realtimetrains.co.uk/service/*",
        "http://www.realtimetrains.co.uk/service/*",
        "http://realtimetrains.co.uk/service/*"
      ],
      "css": [
        "ol.css",
        "rttMapper.css"
      ],
      "js": [
        "ol.js",
        "rttMapper.js",
        "mapPage.js"
      ]
    },
    {
      "matches": [
        "https://www.realtimetrains.co.uk/search/*",
        "https://realtimetrains.co.uk/search/*",
        "http://www.realtimetrains.co.uk/search/*",
        "http://realtimetrains.co.uk/search/*"
      ],
      "css": [
        "ol.css",
        "rttMapper.css"
      ],
      "js": [
        "ol.js",
        "rttMapper.js",
        "searchPage.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "crs.json",
    "tiploc.json",
    "img/*.*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{751b50f7-4233-496c-a2f1-ba55e5e2994b}"
    }
  }
}