urlcontainers

Project information

Project Overview

Firefox WebExtension (Manifest v2) that automatically routes URLs to specific Firefox containers based on wildcard pattern matching. Supports both persistent containers and ephemeral containers that auto-delete when all tabs close.

What are Firefox Containers?

Firefox containers (Multi-Account Containers) are isolated browsing environments within the same browser window. Each container has its own separate:

Cookies and session storage Logged-in accounts Cache and browsing history partitions

Tabs in different containers cannot share authentication state. This allows users to:

Log into multiple accounts on the same site simultaneously Keep work and personal browsing separate Isolate development/staging/production environments

Containers are visually indicated by a colored underline on the tab. The browser.contextualIdentities API provides CRUD operations for containers.