Examine source code of WikimapiaFix

{
  "manifest_version": 2,
  "name": "WikimapiaFix",
  "version": "1.0",
  "permissions": [
    "storage"
  ],
  "description": "Under development.",
  "icons": {
    "48": "icons/border-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@WikimapiaFix.GraniteBox"
    }
  },
  "browser_action": {
    "default_popup": "popup.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "http://wikimapia.org/",
        "https://wikimapia.org/"
      ],
      "js": [
        "WikimapiaFix.js"
      ]
    }
  ]
}