Keep work and personal logins apart with Firefox container tabs

Firefox containers isolate a site's cookies and sign-in state between named groups of tabs. That is useful when one service has separate work and personal identities. It reduces accidental account crossover but does not change the computer, IP address or a malicious site's ability to see what you enter into its own page.

Before you start​

Check whether your Firefox version includes built-in container tabs or needs Mozilla's Multi-Account Containers extension. Decide which two account contexts you genuinely need.

Do it step by step​

1. Enable container tabs in Firefox settings or install Mozilla's own container extension through the official add-on route if your version requires it.
2. Create clearly named Work and Personal containers. Open the service in Work and sign in with the work identity.
3. Open a second tab for the same service in Personal and sign in with the personal identity. Check the container color and label before typing or posting.
4. If you use the extension's site-assignment feature, verify its rule by opening a new tab; make sure it routes to the intended identity rather than silently switching an existing task.
5. Before sharing a document or publishing a message, look at the displayed account avatar and destination. Keep that human check even after the container rule is working.

Check the result​

The two tabs should show different signed-in accounts without repeatedly signing each other out. A fresh tab should open in the container you intended.

If something goes wrong​

A link can open in another container or an ordinary tab depending on settings. If account mixing returns, inspect the tab's container label and site assignment before clearing all browser data.

Know the limit​

Containers separate site data inside one browser profile; they do not provide device isolation, conceal your network identity or replace a separate work profile where policy requires one. Mozilla container-tabs guide