Examine source code of Tab Shuffle

{
  "manifest_version": 2,
  "name": "Tab Shuffle",
  "version": "1.0",
  "description": "Shuffle the order of all open tabs in the current window randomly when the toolbar button is clicked.",
  "icons": {
    "48": "icons/icon48.svg",
    "128": "icons/icon128.svg"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Shuffle Tabs",
    "default_icon": {
      "48": "icons/icon48.svg"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{44d71432-1783-464d-8317-0a1e5fe1a351}"
    }
  }
}