Examine source code of Wikipedia Lists

{
  "manifest_version": 2,
  "name": "Wikipedia Lists",
  "version": "1.0",
  "description": "Use wikipedia reading lists, just like in the apps",
  "icons": {
    "48": "assets/icon_48x48.png",
    "128": "assets/icon_128x128.png"
  },
  "browser_action": {
    "default_icon": "assets/icon_48x48.png",
    "default_title": "Wikipedia Lists",
    "default_popup": "index.html"
  },
  "permissions": [
    "*://*.wikipedia.org/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{34ac60a5-e752-456e-9e4e-29b71defcb44}"
    }
  }
}