Examine source code of Wiki Helper

{
  "name": "Wiki Helper",
  "version": "1.0.0",
  "description": "Look up Wikipedia without switching windows",
  "manifest_version": 2,
  "author": "Ben Sadel",
  "icons": {
    "128": "images/black.png"
  },
  "browser_action": {
    "default_icon": {
      "128": "images/black.png"
    },
    "default_popup": "index.html",
    "default_title": "Wiki Helper"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{22E226B7-424F-408A-88A7-1C6930324D16}"
    }
  }
}