Examine source code of Wordreference Shortcut

{
  "manifest_version": 2,
  "name": "Wordreference quick search",
  "version": "1.3",
  "description": "Search directly wordreference from the address bar",
  "icons": {
    "48": "icons/48pxIcon.png",
    "96": "icons/96pxIcon.png"
  },
  "omnibox": {
    "keyword": "wr"
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "wordreference_quick_search@mpascucci.github.io"
    }
  },
  "background": {
    "scripts": [
      "wordreference_quick_search.js"
    ]
  }
}