According to AIbase, it has announced a major visual overhaul called "Project Nova." This version is planned to be rolled out gradually later this year, focusing on modernizing the interface, enhancing privacy controls, and upgrading productivity experiences. The most anticipated feature is the redesigned "Settings" page, which will include a unified toggle switch allowing users to turn off all current and future AI features with one click, further strengthening the browser's controllability in terms of privacy transparency.

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Project Nova adopts a more rounded visual language, including bubble-style tabs, rounded toolbars, and a new flame-inspired color scheme. Mozilla also updated its icon system to improve visual consistency between light and dark themes. The new interface will also restore Firefox's previously removed "Compact Mode," increasing visible space by compressing browser controls like back and forward, and optimizing the efficiency of accessing tab groups, split-screen views, and vertical tabs.

In terms of AI feature management, Mozilla emphasized that unless users actively enable them, related AI models will not be downloaded to local devices. Even if users install some AI features, the new settings page will more intuitively display installed modules and their storage usage. Mozilla uses this as a differentiation from Chrome, which recently faced controversy over default downloads of about 4GB of AI models.

Aside from the visual changes, Mozilla also officially launched the Web Serial API in Firefox 151 this week, allowing websites to directly connect and control external devices, such as performing firmware updates or hardware interactions, without additional local applications. Firefox 151 also includes a new homepage, fresh wallpapers, and the ability to merge multiple PDF files within the PDF viewer.