Examine source code of Extemp's Cool Words!

{
  "manifest_version": 2,
  "name": "words_extensions",
  "description": "Words and definitions of the day, of words Extemp thinks are cool.",
  "version": "0.0.1",
  "browser_action": {
    "default_icon": {
      "240": "icons/icon-240.jpg"
    },
    "default_title": "Extemp's Cool Words!",
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{47fadac0-4fa2-4f72-a703-b9b7d3115dc0}"
    }
  }
}