Examine source code of Siimpl Bookmarking

{
  "name": "Siimpl Bookmarking",
  "version": "1.19",
  "description": "A beautiful, siimpl way to organize",
  "manifest_version": 2,
  "content_scripts": [
    {
      "js": [
        "contentscript.js"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "web_accessible_resources": [
    "index.html"
  ],
  "icons": {
    "16": "logo.png",
    "48": "logo.png",
    "128": "logo.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "logo.png",
      "32": "logo.png"
    },
    "default_title": "Siimpl Bookmarking",
    "default_popup": "popupbasic.html"
  },
  "content_security_policy": "script-src 'self' https://cdn.firebase.com https://apis.google.com https://www.gstatic.com https://cdnjs.cloudflare.com/ https://connect.facebook.net/ https://code.jquery.com/ https://stackpath.bootstrapcdn.com/ https://cdnjs.cloudflare.com/ajax/libs/animate.css/4.1.1/animate.min.css  'sha256-p5hOtlld76OubQRjuoOzFkH1phfMCtQyYciqJYR0hgk=' 'sha256-p5hOtlld76OubQRjuoOzFkH1phfMCtQyYciqJYR0hgk='; object-src 'self'",
  "permissions": [
    "activeTab",
    "contextMenus",
    "tabs",
    "notifications",
    "storage",
    "identity",
    "<all_urls>",
    "chrome-extension://imoloeebnehinfjpmeegpcdkhbnlomhg/index.html"
  ],
  "background": {
    "page": "background.html"
  },
  "commands": {
    "show-dash": {
      "suggested_key": {
        "default": "Alt+S",
        "mac": "Alt+S"
      },
      "description": "Toggle feature foo"
    }
  }
}