Examine source code of Simple Bookmarker

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Simple Bookmarker",
  "browser_action": {
    "default_icon": {
      "16": "images/logo16.png",
      "48": "images/logo48.png",
      "64": "images/logo64.png",
      "128": "images/logo128.png"
    },
    "default_title": "A Simple Bookmarker",
    "default_popup": "index.html"
  },
  "icons": {
    "16": "images/logo16.png",
    "48": "images/logo48.png",
    "64": "images/logo64.png",
    "128": "images/logo128.png"
  },
  "description": "A Simple bookmarker.Features include :  Saving custom input, Saving current tab, etc",
  "permissions": [
    "tabs"
  ],
  "author": "Omkar Bhoir"
}