Firefox 139 Beta Review: Faster HTTP/3 Uploads & New Features

 

Firefox 139 Beta boosts HTTP/3 upload speeds, adds full-page translation, and preserves PNG transparency—ideal for developers, designers, and businesses. Download now for enhanced performance!

Mozilla’s latest Firefox 139 Beta introduces significant performance upgrades, including enhanced HTTP/3 upload speeds, full-page translation, and improved image handling—here’s what you need to know.

While Firefox 138 was a modest update focused on profile management and Tab Groups, Firefox 139 Beta delivers tangible improvements for power users and enterprises. 

The standout feature? Dramatically faster HTTP/3 upload performance, particularly for high-latency connections.

Key Improvements in Firefox 139 Beta

1. Faster HTTP/3 Upload Speeds

Firefox 139 Beta optimizes HTTP/3 upload performance, especially for:

• QUIC 0-RTT resumed connections (reducing handshake delays)

• High-bandwidth, high-latency networks (ideal for remote work and cloud services)

Mozilla claims "significantly improved" speeds, making Firefox more competitive with Chromium-based browsers in enterprise and developer use cases.

2. Full-Page Translation for Extensions

Firefox now supports full-page translation within extension pages, eliminating language barriers for users managing:

• Privacy tools (uBlock Origin, NoScript)

• Developer extensions (WebExtensions API)

3. Preserved Transparency in PNG Images

A subtle but valuable upgrade for designers and content creators:

• PNG transparency is now maintained when pasting into Firefox

• Fixes a long-standing issue affecting workflows in Figma, Photoshop, and Canva

4. Hidden-Until-Found Attribute Support

Web developers gain better control over page content with:

• hidden=until-found attribute (content remains hidden until searched via Ctrl+F)

• Useful for dynamic web apps, documentation, and e-learning platforms

Why Firefox 139 Beta Matters for Users & Businesses

This update isn’t just for tech enthusiasts—businesses, developers, and privacy-focused users benefit from:
✅ Faster cloud uploads (critical for SaaS, VPNs, and remote teams)

✅ Seamless multilingual support (boosting global user engagement)

✅ Professional-grade image handling (benefiting designers and marketers)

Download & Final Thoughts

Firefox 139 Beta is available now on Mozilla.org. If you rely on fast, privacy-respecting browsing, this update is worth testing.

Will Firefox’s HTTP/3 optimizations help it compete with Chrome in enterprise environments? Let us know in the comments.