Waterfox 6.7 brings full redesign, native tree tabs, improved ad blocking, and much more

Waterfox 6.7 “Supernova” is now available as the latest release of this privacy-focused, Firefox-based browser. This update shifts Waterfox’s core from Gecko ESR 140 to Gecko ESR 153, bringing a full year of upstream engine, performance, and security improvements. Most of Waterfox’s custom layer has been rebuilt to natively run on the updated platform, enhancing compatibility and efficiency.

Alongside engine upgrades, Waterfox 6.7 expands visual customization. Users can now choose between three base browser styles: Nova, a sharper new option; Proton, offering a modern interface; and Photon, retaining the classic Waterfox look refined with Lepton chrome. The previous accent color feature is replaced by twelve new palettes, each with light and dark versions selectable for system theme alignment.

Building on UI changes, tree-style tabs are now built directly into the browser’s vertical tab strip, replacing the bundled extension with a leaner native implementation. In addition, the built-in ad blocker introduces a dedicated settings panel, displaying its operational status.

Following these functional updates, legacy add-on support is improved by reworking preference management, protecting user configurations when extensions are removed or disabled. Waterfox now supports installing system add-ons without Mozilla signatures. Onboarding for new users is upgraded with a localized, single-page experience, and Firefox profile migration is improved, ensuring comprehensive data transfer.