Examine source code of upStart

{
  "manifest_version": 2,
  "name": "upStart",
  "short_name": "upStart",
  "description": "Bookmark Organizer",
  "version": "2",
  "browser_action": {
    "default_title": "upStart",
    "default_icon": "img/icon64.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "web_accessible_resources": [
    "js/*.json",
    "newtab.html"
  ],
  "homepage_url": "https://github.com/anfabio/upstart",
  "permissions": [
    "file:///*/",
    "tabs",
    "management",
    "alarms",
    "storage",
    "unlimitedStorage",
    "contextMenus",
    "<all_urls>",
    "notifications",
    "bookmarks"
  ],
  "chrome_url_overrides": {
    "newtab": "main.html"
  },
  "background": {
    "scripts": [
      "js/chrome-extension-async.js",
      "js/lz-string.min.js",
      "js/dropbox.min.js",
      "js/functions.js",
      "js/background.js"
    ]
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  }
}