Examine source code of Lazy Read

{
  "manifest_version": 2,
  "name": "Lazy Read",
  "version": "1.0",
  "chrome_url_overrides": {
    "newtab": "lazy-read.html"
  },
  "description": "On opening a New Tab, open a random bookmark from a folder you've chosen.",
  "homepage_url": "https://github.com/surajk95/lazy-read",
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "icons": {
    "48": "icons/lazy-read.png"
  },
  "browser_action": {
    "default_icon": "icons/lazy-read.png",
    "default_title": "Lazy Read",
    "default_popup": "settings/settings.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "surajkukati95@gmail.com"
    }
  }
}