‘Project Nova’ in progress to round out Firefox’s UI and bring back Compact Mode

Mozilla says it is moving forward with Project Nova, a major Firefox redesign centered on a unified design system.

The update will reshape tabs, colors, and settings, while also bringing back compact mode, a longtime user request.

The changes are expected to affect both desktop and mobile Firefox, with a broader focus on usability and privacy controls.

Mozilla is aiming to roll out the refreshed experience in the second half of 2026.