Mozilla Adds Native Containers to Firefox 153 as a Preview Feature

Mozilla has released a preview of native Containers in Firefox 153, integrating the functionality of the Multi-Account Containers extension directly into the browser.

According to Mozilla's announcement published on July 21, 2026, Containers separate cookies and tracking data between different browsing contexts, enabling users to stay signed into multiple accounts on the same site within a single window. This feature is available by default in Firefox 153 and does not require an extension.

Mozilla notes that this is a preview release. The built-in version does not yet include all the features of the original Multi-Account Containers extension.

What Firefox 153’s Native Containers Do and What’s Included in the Preview

Each container has its own cookie jar. Activity in one container isn’t visible to sites loaded in another, preventing cross-context tracking between different parts of a user's browsing. Mozilla explains this by pointing out that product searches in one container won’t trigger ads in unrelated browsing sessions.

Mozilla highlights practical uses such as managing multiple accounts on the same social platform, separating work projects from personal shopping, and isolating banking activity from regular browsing.

The Multi-Account Containers extension has supported this for nearly a decade, and Mozilla states that the native feature maintains the core functionality, flexibility, and visual identity of the add-on.

With the Firefox 153 preview, users can open tabs in specific containers, create and manage containers with custom names, colors, and icons, and adjust container settings via the Firefox settings interface.

Mozilla explains that integrating Containers as a first-party feature aims to keep the capability visible by default. The goal is to avoid requiring users to find an add-on and to support ongoing development of the feature directly within Firefox.

How to Create and Use Containers in Firefox 153

Containers can be accessed through the t…