Examine source code of Omnibookmarks

{
  "manifest_version": 2,
  "name": "Omnibookmarks",
  "version": "1.0",
  "omnibox": {
    "keyword": "b"
  },
  "permissions": [
    "notifications",
    "tabs",
    "bookmarks"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "img/icon_16.png",
    "48": "img/icon_48.png",
    "128": "img/icon_128.png"
  }
}