Examine source code of Stackoverflow Shortcut

{
  "manifest_version": 2,
  "name": "Stackoverflow quick search",
  "version": "1.2",
  "description": "Search directly Stackoverflow from the address bar",
  "icons": {
    "48": "icons/48px-stackoverflow-quick-search.png",
    "96": "icons/96px-stackoverflow-quick-search.png"
  },
  "omnibox": {
    "keyword": "so"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "stackoverflow_quick_search@mpascucci.github.io"
    }
  },
  "background": {
    "scripts": [
      "stackoverflow_quick_search.js"
    ]
  }
}