Examine source code of Lango

{
  "name": "Language Recognizer",
  "version": "1.0.1",
  "description": "A chrome extension inspired for language detection of your website",
  "icons": {
    "128": "icon_128.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "lang.html"
  },
  "permissions": [
    "activeTab"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff2bf357-e993-43b2-9e57-bc4227c1b2a8}"
    }
  }
}