Examine source code of Wanderlog Plus

{
  "manifest_version": 2,
  "name": "Wanderlog Plus",
  "version": "0.1",
  "description": "Enhances features of Wanderlog.com",
  "icons": {
    "48": "icons/wlplus-48.png",
    "96": "icons/wlplus-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.wanderlog.com/plan/*"
      ],
      "js": [
        "wanderlogplus.js"
      ]
    }
  ],
  "permissions": [
    "https://openflights.org/php/alsearch.php"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d5d9fe07-e219-4333-b152-1e1896ae4773}"
    }
  }
}