Examine source code of URL Shortener

{
  "version": "0.1.2",
  "manifest_version": 2,
  "name": "URL Shortener",
  "short_name": "g-url-shortener",
  "background": {
    "page": "lib/chrome/background.html"
  },
  "description": "Easily shorten desired urls via Rebrandly API.",
  "homepage_url": "http://mybrowseraddon.com/g-url-shortener.html",
  "options_ui": {
    "chrome_style": true,
    "page": "data/options/options.html"
  },
  "permissions": [
    "storage",
    "contextMenus",
    "notifications",
    "clipboardWrite"
  ],
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  }
}