Examine source code of Tab Auto Close

{
  "background": {
    "scripts": [
      "TabMonitor.js"
    ]
  },
  "manifest_version": 2,
  "name": "Tab Auto Close",
  "author": "Rushikesh Tade",
  "developer": {
    "name": "Rushikesh Tade",
    "url": "https://github.com/rushikesh988/TabAutoClose"
  },
  "version": "1.2resigned1",
  "description": "Auto Close your unused tabs.",
  "homepage_url": "https://github.com/rushikesh988/TabAutoClose",
  "icons": {
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "200": "icons/icon200.png"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "notifications",
    "tabs",
    "<all_urls>",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon200.png",
    "default_title": "Tab Auto Close"
  },
  "applications": {
    "gecko": {
      "id": "rushikesh988-3@gmail.com"
    }
  }
}