Examine source code of Wikipedia

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-1.png"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Wikipedia",
  "manifest_version": 2,
  "description": "Word \"Wikipedia\" in 9 languages.\nFrome left to right Ελληνικά English Français हिन्दी 日本語 한국어 русский ภาษาไทย 中文"
}