Examine source code of Random Bookmark

{
  "description": "Open a random bookmark in current tab",
  "name": "Random Bookmark",
  "permissions": [
    "activeTab",
    "bookmarks"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "19": "icons/png/bookmarky19.png",
      "38": "icons/png/bookmarky38.png"
    },
    "default_title": "Open Random Bookmark"
  },
  "web_accessible_resources": [
    "icons/bookmarky_attribution"
  ],
  "version": "1.0.0",
  "homepage_url": "https://github.com/jbaber/random-bookmark-extension",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icons/png/bookmarky48.png",
    "96": "icons/png/bookmarky96.png"
  }
}