Firefox 153 brings Containers into the browser

Mozilla is turning Containers into a built-in feature in Firefox 153, bringing a long-running capability from its Multi-Account Containers extension directly into the browser.

The preview lets users keep parts of their online life — such as work, shopping, personal, and banking — in separate browser containers while isolating cookies and ad tracking inside each one. In practice, activity in one container is not visible to others, which Mozilla says should make it easier to avoid cross-context tracking and stay signed into different accounts in the same browser window.

Mozilla said the move is meant to make the feature easier to find and use, without requiring users to install an add-on first. The company also said it wants to preserve the core behavior, flexibility, and visual identity that existing extension users rely on while continuing to invest in Containers as a first-party Firefox feature.

In the Firefox 153 preview, users can:

• Open tabs in specific containers
• Create and manage containers with custom names, colors, and icons
• Control container settings directly from Firefox Settings

To start, Mozilla says users can right-click any tab or long-press the new tab (+) button to open a container tab, or create one from Settings.

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For people already using Multi-Account Containers, Mozilla says no special migration steps are needed. The add-on can continue running alongside the built-in version, and Mozilla notes that not all extension features are available yet in the native implementation.

Mozilla is asking for feedback on the preview through a Mozilla Connect thread as it continues to build out the feature.

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