mozilla/multi-account-containers

Firefox Multi-Account Containers is a Firefox browser extension that isolates your browsing into color-coded containers with separate cookie storage.

The extension solves the problem of cookie tracking across websites by compartmentalizing your browsing activity. Each container maintains its own set of cookies, allowing you to log into the same website with different accounts simultaneously or prevent trackers from following you across sites. The approach works by assigning tabs to containers and enforcing cookie isolation at the browser level, so websites cannot access cookies from other containers even when you visit them from different tabs.

The tool suits anyone who needs to maintain multiple online identities or accounts on the same websites, such as managing personal and work email accounts, testing websites with different user roles, or simply reducing cross-site tracking. It is particularly valuable for privacy-conscious users who want to limit how much information trackers can gather about their browsing habits. The extension integrates directly into Firefox's tab interface, making it straightforward to assign tabs to containers without requiring technical configuration.

The project maintains active development with regular updates addressing user-reported issues and Firefox compatibility. The codebase shows consistent attention to bug fixes and feature refinements based on user feedback. Development activity demonstrates responsiveness to the extension ecosystem's evolution and ongoing maintenance of the extension's core functionality.