Firefox Containers Preview in Firefox 153

Overview

Firefox 153 ships a preview of a built‑in Containers feature that lets users keep separate online activities—such as work, shopping, personal, and banking—logged into different accounts in the same window while keeping cookies and ad tracking isolated inside each container.

Why Mozilla Integrated Containers

Making Containers a native, first‑party feature achieves four goals: it becomes visible by default so users do not need to search for an add‑on; it simplifies workflow by placing container controls in familiar places; it preserves the core functionality, flexibility, and visual identity long‑time users rely on from the Multi‑Account Containers extension; and it drives continued investment in the feature as a first‑party citizen of Firefox.

What the Preview Includes

In this preview release users can:

• Open tabs in specific containers to isolate browsing activity by context.
• Create and manage containers with custom names, colors, and icons.
• Control container setup directly from the Firefox settings surface.
• Start by right‑clicking any tab or long‑pressing the new‑tab (+) button to open a container tab, or by visiting Firefox Settings to create the first container.

Community Feedback and Use Cases

Commenters describe a variety of ways they use containers:

• Managing multiple Google accounts (work and private) side by side, with different colors for quick identification.
• Isolating untrusted sites such as Facebook or banking sites.
• Testing the same application for different customers with dedicated containers per customer.
• Keeping social media, shopping, and banking in separate containers to avoid cross‑site tracking.
• Using containers together with proxy or VPN extensions for more advanced setups.

One user notes the value of the "Always open {{domain}} in this container" rule and keyboard shortcuts, saying they "can’t imagine life without them anymore." Another highlights that containers allow tabs from different contexts to appear side by side, a capability not offered by traditional browser profiles.

Migration and Compatibility with the Multi‑Account Containers Extension

Users wonder how to transition from the extension to the native feature without losing their setup. One commenter asks whether containers created by the extension are already shared with Firefox’s native container manager or if a migration process exists, and whether they can safely uninstall the extension while retaining container names, colors, icons, cookies, and active sessions.

The blog post acknowledges that not all features of the Multi‑Account Containers extension are available in the first‑party version yet, and that users can continue to run the extension alongside the built‑in containers if they need the missing functionality.

Comparison with Browser Profiles

Some commenters compare containers to Firefox profiles. One user argues that profiles provide harder boundaries because there is no risk of accidentally logging in with Google from a news‑reading profile, while containers may feel "too squishy." Another user wonders what the trade‑offs are between the two approaches and mentions interest in tools to create and manage profiles on the fly.

Known Limitations and Future Plans

Feedback points to several missing pieces that users hope will appear in future iterations:

• Site‑specific container assignments ("Always open {{domain}} in this container)).
• Syncing of container configurations across devices.
• Integration with Mozilla VPN or custom proxies.
• Ability to set a container as the default for external links (e.g., from Slack).
• Improved UI for managing containers, reducing the need to hunt through menus.
• Support for temporary containers.
• Availability on Android.

One commenter notes that the underlying container preference (privacy.userContext.enabled) has existed in Firefox for years and can be enabled via about:config, suggesting that the preview may primarily involve making the feature visible and enabled by default rather than introducing entirely new technology.

Closing Thoughts

The preview represents Mozilla’s first step toward making Firefox more adaptable to how people live and work online, with plans to refine the experience and lay a foundation for future context‑separation features.