Firefox 153 previews 'new' Containers a user traced back to 2017 (blog.mozilla.org)
Firefox 153 folds container tabs (separate cookie jars, colors, and icons for banking, work, and shopping) directly into the browser, ending reliance on Mozilla's own Multi-Account Containers extension for basic isolation.
The pushback was immediate: a reader traced the same interface back to a 2017 Mozilla documentation snapshot and a 2023 support page, arguing the 'preview' label hides that containers have quietly existed for years.
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