Examine source code of SeamapPlus

{
  "manifest_version": 2,
  "name": "SeamapPlus",
  "author": "Jodli",
  "version": "2.2.5resigned1",
  "description": "Erweitert die Seekarte von Escaria.com um viele nützliche Funktionen.",
  "homepage_url": "http://forum.escaria.com/index.php?page=Thread&threadID=8557",
  "icons": {
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "64": "icons/icon_64.png",
    "96": "icons/icon_96.png",
    "128": "icons/icon_128.png"
  },
  "applications": {
    "gecko": {
      "id": "{ebbf714c-875b-4e14-a4b4-edb412648271}",
      "strict_min_version": "45.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.escaria.com/world/client*"
      ],
      "js": [
        "seamapplus2.js"
      ],
      "css": [
        "seamapplus2.css"
      ]
    }
  ]
}