Examine source code of pronto.click

{
  "name": "pronto.click",
  "description": "Simple private URL redirection.",
  "version": "1.4",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "256": "prontoclick.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "clipboardWrite",
    "contextMenus",
    "http://*/*",
    "https://*/*"
  ],
  "options_ui": {
    "browser_style": true,
    "page": "options.html"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "prontoclick.png",
    "default_title": "pronto.click",
    "default_popup": "popup.html"
  }
}