- Sources: Mozilla blog, HN 48995409
- Summary: Mozilla announced on 2026-07-21 a preview of containers as a native Firefox feature in version 153, moving the core of the Multi-Account Containers extension into the browser. Cookies and tracking state stay isolated per container, containers carry a name, color, and icon, and they are configured from Firefox preferences rather than an add-on. Mozilla states not every extension feature is present yet and the extension can still be used alongside the built-in version. The post was on the HN front page at 259 points when checked on 2026-07-25.
- Why it matters: Per-container cookie isolation in the browser itself is the cheapest way to hold several authenticated sessions against the same service, which is routine for anyone working across staging, production, and client accounts.
- Follow-up: Watch for feature parity with the extension and whether containers ship enabled outside the preview.
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