Examine source code of Pregnancy Ticker

{
  "manifest_version": 2,
  "name": "Pregnancy Ticker",
  "version": "2.2",
  "description": "__MSG_description__",
  "homepage_url": "http://addons.andreas-ratke.de/",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "default_popup": "popup.html"
  },
  "applications": {
    "gecko": {
      "id": "pregnancyticker@andreas-ratke.de"
    }
  }
}