Firefox 157 brings Project Nova's warmer colors, softer tabs, refreshed icons, and rounded corners across desktop and mobile. Early designs had floating toolbars, chrome-to-page gaps and pastel gradients, but complaints about wasted space pushed Mozilla to soften the rounding and restore Compact Mode. Public testing and listening to what users hated counts as good UX, even as the rounded, gradient-heavy look risks modernizing Firefox into sameness.