Mozilla’s open-source browser gets a visual overhaul with refreshed navigation, tabs, settings and personalisation options.
Mozilla has released Firefox 157, bringing a redesigned user interface to its open-source web browser. The release expands the Project Nova redesign, with changes to navigation, tabs, icons, spacing and browser surfaces intended to modernise the browsing experience while retaining Firefox’s focus on customisation. Firefox 157 ships on 29 September 2026.
The redesign changes several core parts of the browser interface, including the toolbar, menus, tabs and settings. Mozilla has also introduced updated themes, wallpapers and other personalisation options. The changes have been developed through the Firefox community, with Mozilla using feedback from users and testing through its Nightly development channel before wider deployment.
Firefox 157 also adds developer-facing improvements. WebGPU now supports the TRANSIENT_ATTACHMENT texture usage type, allowing developers to create memory-efficient attachments intended for use within a render pass. The feature can keep related render-pass operations in tile memory, potentially reducing VRAM traffic and avoiding additional texture memory allocation.
The release also includes changes for developers and administrators. CSS support has been extended with the at-rule() function for testing browser support for CSS at-rules. Firefox 157 additionally introduces an option for administrators to control on-device speech recognition through the AIControls policy, while policy reporting now identifies individual entries that fail to apply correctly.
As an open-source browser, Firefox continues to develop its interface and underlying web technologies through Mozilla and its contributor community. Project Nova is being developed publicly through Firefox Nightly, where users can test changes and report issues covering areas such as accessibility, keyboard navigation, screen readers and different display configurations. This gives the wider community an opportunity to provide feedback as Mozilla continues refining the new interface.
