firefox 157

Firefox 157 is the Mozilla release that makes Nova, the redesigned Firefox interface, the default for desktop users on September 29, 2026. Coverage under this tag focuses on what changes visually and functionally: softer tabs, refreshed icons, a warmer colour palette, and the return of Compact Mode, plus easier access to tab groups, split view and vertical tabs. Mozilla says extensions, shortcuts and menus stay where users expect them, framing Nova as the biggest look change since 2021 but largely a coat of paint. Discussion also notes Firefox 157 still supports the full Manifest V2 version of uBlock Origin, which Chrome no longer runs.