OFICIAL Mozilla Blog Finance & Crypto · Jul 21, 2026

Firefox Containers Preview

What happened

Based on Mozilla Blog · Jul 21, 2026

Mozilla integrates Containers into Firefox 153, allowing users to separate browsing activities like work, shopping, or banking into isolated sessions within a single window, replacing the need for the Multi-Account Containers extension.

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Mozilla Blog — Mozilla

Key points

This means that stuff you do in one container isn’t seen by other containers.

No longer will you search for a new hat to wear to a party, only to be inundated with ads for hats at every twist and turn on the internet for weeks to come.

For almost a decade, many of you have relied on its Multi-Account Containers extension to keep work, personal, and privacy-sensitive browsing separate without needing multiple browsers or profiles.

We’ve heard your feedback and understood the value you find in that separation.

Key numbers

Mozilla has introduced Containers as a native feature in Firefox version 153, enabling users to maintain distinct browsing sessions for different activities such as work, personal use, or banking within the same browser window. The feature isolates cookies and ad tracking to each container, preventing cross-contamination of data between sessions. This addresses common issues like targeted ads following users after unrelated searches. The integration eliminates the need for separate browser profiles or multiple browser installations to maintain separation.

The Containers feature builds on the existing Multi-Account Containers extension, which has been available for nearly a decade. While the extension will remain available, its core functionality is now embedded directly into Firefox 153. Mozilla acknowledges that not all extension features are immediately available in the native version and encourages users to continue using the extension alongside the built-in feature if needed. The company emphasizes that this is an initial release, with plans to expand functionality in future updates.

Mozilla positions the Containers feature as a response to user feedback highlighting the need for better separation of online activities. The company suggests practical applications include managing multiple social media accounts, separating work projects from personal browsing, or isolating sensitive activities like banking. By making Containers a first-party feature, Mozilla aims to simplify the user experience while providing greater control over privacy and data separation.

Users are encouraged to provide feedback on the new Containers Preview through a Mozilla Connect thread to help shape future development. Mozilla frames this release as the first step in enhancing Firefox’s adaptability to diverse online workflows. The company hints at future refinements and additional features that could further improve context separation, though specific details remain unspecified. Feedback will play a critical role in guiding these developments.

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