Mozilla has rolled out Firefox 139.0 ahead of its official announcement, introducing performance enhancements, new web standards support, and experimental features that elevate browsing efficiency.
This update is particularly significant for developers, power users, and enterprises leveraging HTTP/3, WebAuthn, and advanced web APIs.
Key Features in Firefox 139.0
1. Faster HTTP/3 Upload Speeds
Firefox 139 delivers "significantly improved" HTTP/3 upload performance, especially for:
QUIC 0-RTT resumed connections
High-bandwidth, high-latency networks
Benchmarks suggest noticeable gains in file transfers, cloud backups, and media uploads—ideal for remote work, SaaS applications, and enterprise environments.
2. Full-Page Translation for Extensions
Firefox now supports full-page translation within extension pages, eliminating language barriers for users managing cross-border e-commerce, research, or localized workflows.
3. Enhanced Image Handling & Web Standards
PNG transparency preserved when pasting into Firefox
WebAuthn largeBlob extension support for secure authentication
"hidden=until-found" attribute for hidden content discoverable via Ctrl+F
4. Linux-Specific Optimizations
Linux users benefit from improved rendering stability and memory management refinements, making Firefox 139 a strong alternative to Chrome and Edge on open-source platforms.
Experimental Features (Disabled by Default)
For developers testing next-gen web capabilities:
Prioritized Task Scheduling API (optimized background processing)
View Transition API (smoother page transitions)
Removal of non-standard
beforescriptexecute/afterscriptexecuteevents
Where to Download Firefox 139.0
Grab the latest binaries now via Mozilla’s FTP before the official release.
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