Firefox Nova brings compact mode and more visual customization

Published on May 23, 2026 | Translated from Spanish

Mozilla advances with the Project Nova redesign, which brings back compact mode to reduce the size of controls. The new proposal includes wallpapers and color themes that cover the entire window, as well as improvements to tab groups, split view, and vertical tabs. Customizing the shape of tabs is also being explored.

Firefox browser window in compact mode, vertical sidebar with grouped tabs expanding and contracting, colorful gradient theme covering entire window frame, split view showing two web pages side by side, tab shapes morphing from rounded to angular, floating control buttons shrinking in size, background wallpaper blending into browser chrome, technical illustration style, clean UI elements with subtle motion trails, soft ambient lighting, minimalist software interface render, photorealistic digital product visualization

Firefox 151 adds support for Web Serial and PDF merging 🚀

Version 151 of the browser is now available with the Web Serial API, which allows websites to communicate with serial devices such as printers or sensors. Additionally, the home page has been redesigned with new wallpapers, and the option to merge multiple PDF files in a single operation has been added. These features aim to meet technical needs without relying on external extensions.

Now even tabs want to change shape 🤔

Mozilla says it might allow customizing the shape of tabs. Because, of course, what we all were asking for was for tabs to be round, square, or potato-shaped. Meanwhile, users will continue to wait for a feature that actually removes tabs that don't close. But hey, at least we'll be able to choose between a starry or floral background.