---
title: The _ab cookie will no longer be set - Shopify developer changelog
description: Shopify’s developer changelog documents all changes to Shopify’s platform. Find the latest news and learn about new platform opportunities.
source_url:
  html: https://shopify.dev/changelog/the-ab-cookie-will-no-longer-be-set
  md: https://shopify.dev/changelog/the-ab-cookie-will-no-longer-be-set.md
---

[Back to Developer changelog](https://shopify.dev/changelog)

July 12, 2025

Tags:

* Themes

# The `_ab` cookie will no longer be set

### What's changing?

Starting on August 18th, 2025, Shopify will no longer set the `_ab` cookie on merchant storefronts or checkout. This cookie was used to enable/disable the preview bar.

You can hide the preview bar while previewing a theme by adding the `pb=0` parameter to the URL.