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.
Summary extracted from the official source text. Verify details on the source page.
| Platform | Shopify |
|---|---|
| Effective date | 2025-08-18 (passed) |
| Precision | day |
| Published | 2025-07-12 |
| Categories | DeprecationTracking & signal loss |
| Tags | Deprecation announcement, Themes |
| Official source | Shopify developer changelog ↗ |
| Fetched | 2026-10-17T03:44:00+00:00 |
| First seen | 2026-10-17T01:05:46+00:00 |
| Status | Listed by the source |
| Stable ID | shopify-f91c64da1b · JSON |