Mozilla releases preview of native containers firefox 153Integrating the functionality of the Multi-Account Container 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, allowing users to remain signed in to multiple accounts on the same site in the same window. This feature is available by default in Firefox 153 and does not require any extension.
Mozilla notes that this is a preview release. The built-in version does not yet include all the features of the native Multi-Account Container 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 is not visible on sites loaded in another, preventing cross-reference tracking between different parts of a user’s browsing. Mozilla explains this by stating that product searches in a container will not 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 purchases, and separating banking activity from regular browsing.
The Multi-Account Container extension has supported it for nearly a decade, and Mozilla says the original feature maintains the add-on’s core functionality, flexibility, and visual identity.
With Firefox 153 Preview, users can open tabs to specific containers, create and manage containers with custom names, colors, and icons, and adjust container settings through the Firefox Settings interface.
Mozilla states that the purpose of integrating containers as a first-party feature is to keep the capability visible by default. The goal is to avoid users needing to find an add-on and support the ongoing development of the feature directly within Firefox.
How to Create and Use Containers in Firefox 153
Containers can be accessed through the tab strip and within Firefox Settings. You can right-click on any tab to open the container from the context menu or long-press the New Tab button to choose a container for the new tab.
Open Firefox Settings to create your first container or rename, change the color, or update the icon of an existing container. You can also manage the entire container list and adjust settings for each container from the same Settings menu.
Existing users of multi-account containers do not need to take any action. Mozilla says the extension can continue to run with the built-in container feature without uninstalling.
Users relying on features not yet available in the original version, such as per-site container rules, should keep the extension installed until Mozilla confirms full equivalence.
Missing features, feedback plans, and what’s next for multi-account containers
Mozilla has not published a list of which multi-account container features are missing from the original implementation, nor has it provided any timeline for when they might be added.
The company describes Firefox 153 as an initial step forward and mentions plans to refine the experience and develop additional context separation features on top of the current foundation.
Mozilla is collecting feedback on the preview through a dedicated thread on Mozilla Connect. The company has not confirmed when containers will move from preview status or whether the multi-account container extension will eventually be discontinued.
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