JancyX

JancyX is an extension for “containerized” browsing in Firefox, designed solely to be used alongside the Jancy browser. JancyX provides a custom browser experience, allowing for the creation and management of multiple sessions, or “Containers”. Utilize custom profiles and proxies, autofill fields, manage tabs, and more. JancyX allows you to tailor Firefox to your multi-session needs.

This is still an experimental tool, and we will be continually updating it. If you encounter issues, or if you have questions or feature requests, please email us or create a Discord support ticket.
The term “Container” in this documentation usually refers to a Container made by JancyX, but will at times refer to other Containers. JancyX can only perform actions on Containers that you create with the extension. If you create other Containers in Firefox outside of the extension’s interfaces, these Containers will be ignored by JancyX actions.
Performance may vary depending on the number of tabs you try to run. In a Firefox context, we do not have the same level of control that we have in Jancy, but we will attempt to optimize performance given the constraints that exist.

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Note: As of version 1.15.0, JancyX is now a permanent extension (no longer a temporary extension). Once installed, JancyX will persist across browser sessions. View the updated Setup Guide for instructions on installing JancyX as a permanent extension.

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You can find the current release here. (v1.15.0 - released 08/14/26)

Setup Guide

User Interfaces

Container & Tab Management

Persistent & Temporary Containers

Preferences & Configuration