Examine source code of Down For Me?

{
  "applications": {
    "gecko": {
      "id": "isupme@vyvl.github.com"
    }
  },
  "name": "Down For Me?",
  "version": "3.0.2resigned1",
  "manifest_version": 2,
  "description": "Checks for a site status using isup.me service",
  "homepage_url": "https://github.com/vyvl/isupme",
  "default_locale": "en",
  "background": {
    "scripts": [
      "src/bg/bg.js"
    ]
  },
  "page_action": {
    "default_icon": {
      "16": "icons/default16.ico"
    }
  },
  "permissions": [
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "http://downforeveryoneorjustme.com/*",
    "alarms",
    "storage"
  ],
  "options_ui": {
    "page": "html/options.html"
  }
}