Examine source code of Auto Close Tabs

{
  "manifest_version": 2,
  "name": "Auto Close Tabs",
  "version": "1.0",
  "description": "Closes tabs after a specified time interval, keeping the first opened tab open.",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "permissions": [
    "tabs",
    "webNavigation",
    "storage"
  ],
  "options_page": "options.html",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon.png",
      "48": "icons/icon.png",
      "128": "icons/icon.png"
    }
  },
  "icons": {
    "16": "icons/icon.png",
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{080b10ed-5d98-4d5e-8e42-5b55ab2dc7ac}"
    }
  }
}