Updated 2026-09-25
Coming soon. The extension isn't in the browser stores yet. This article describes how it will work; until then, use the web app.
The Atrium browser extension fills in your logins and helps you save new ones.
Autofill
On a site's sign-in page, the extension offers the logins saved for that site and fills in the username and password. It checks the address of the page, and of the frame the form is in, before filling, so a login saved for one site isn't offered on another.
Saving and generating
When you sign in somewhere new, the extension can save the login to your vault. It also includes the password generator.
Same account, same keys
It uses the same account and the same two-step unlock as the web app. Keys live only in the extension's memory and are dropped when it locks.
Why the extension is also a security feature
The web app runs code our server sends each time you visit. The extension's code is installed on your computer instead, so it isn't swapped on each visit. That narrows one of the limits of browser-based encryption.