Mozilla has released Firefox 151, introducing several user-facing improvements to the open-source browser. The most visible change is a redesigned Home and New Tab page featuring new built-in wallpapers and foundational support for upcoming widgets and shortcuts. These interface refinements aim to modernize the browser's appearance while maintaining Firefox's familiar workflow.

Practical enhancements include PDF merging capabilities directly within the browser's PDF viewer, allowing users to combine documents without external tools. Privacy features see meaningful upgrades too, with the built-in free VPN now supporting manual server location selection. Additionally, private browsing mode gains a one-click reset function that clears session data and starts fresh.

For developers and hardware enthusiasts, Firefox 151 integrates the Web Serial API, enabling direct microcontroller configuration from the browser. This feature targets Raspberry Pi users, 3D printing hobbyists, and mechanical keyboard enthusiasts using ZMK Studio. The update is available now through Mozilla's website or via automatic browser updates.

These additions strengthen Firefox's appeal among privacy-conscious users and hardware tinkerers, though the browser still faces intense competition from Chrome and Edge.