- Sources: Mozilla blog
- Summary: Firefox 153, released 2026-07-21, adds a preview of native Containers that keeps separate logins (work, personal, banking) isolated by cookie jar in one window, built in and visible by default rather than requiring the Multi-Account Containers add-on. The preview lets users open tabs in a chosen container and customize container names, colors, and icons, though not all add-on features are present yet and both can run side by side.
- Why it matters: Making per-context isolation a first-party feature reduces reliance on an extension for a common privacy and account-separation workflow.
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