Multi-Session Container Tabs is a Firefox extension for opening multiple isolated Container Tabs with the same URL. It supports up to 30 sessions, configurable opening delays, custom naming prefixes, and one-click cleanup for multi-account workflows, testing, and parallel browsing.
In the Browser DevTools & extensions space, Multi-Session Container Tabs takes a focused approach. It focuses on managing multiple isolated browser sessions for separate accounts, testing, and parallel browsing. It is built as a consumer product for firefox users, developers, and testers who need isolated browsing sessions. Multi-Session Container Tabs costs nothing to use. It ships for the web and embeddable surfaces.
Behind Multi-Session Container Tabs is bfriedrich, and it first shipped in 2026. Among its 9 catalogued features are multiple container sessions, isolated cookies, and separate cache. The interface is available in 32 languages, including Czech, German, and Greek.
Summary written by a language model from the project’s public pages.
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