Hello everyone,

I’m very happy to announce the release of PowerFox 26.4.0!

This is a major release with security and bug fixes, performance improvements, web compatibility enhancements, new features, and much, much more. Notably, PowerFox is now the first modern web browser for Mac OS X 10.3 Panther since Firefox 2.0.0.20, which was released 18 years ago!

Implemented support for Mac OS X 10.3 Panther. Builds are available for PowerPC G3, G4 7400, G4 7450, and G5 processors
Implemented performance enhancements, correctness improvements, and crash fixes in the IonPower JavaScript JIT
Implemented OpenGL acceleration on 10.4 builds. Acceleration is available on GeForce FX series or newer and Radeon 9500 series or newer
Implemented 40+ AltiVec optimizations across the browser for improved performance on PowerPC builds
Implemented GPU accelerated H264 decoding on 10.6 builds
Implemented further SSE and AltiVec optimizations in H264, VP8, and VP9 decoders on all builds
Implemented font sanitizer in 10.4 and 10.5 builds to load previously unsupported fonts and prevent crashes
Implemented built-in uBlock Origin and h264ify extensions. Thank you to UCyborg, uBlock Origin developers, WindClan, and h264ify developers for their contributions
Implemented refreshed browser about page
Implemented KaiOS user agent option in PowerFox settings tab
Fixed OpenGL acceleration for GeForce FX series GPUs
Fixed various OpenGL rendering issues on 10.4 and 10.5 builds
Fixed keyboard shortcuts and other input issues on 10.4 builds
Fixed WebRTC issues on 10.5 builds
Fixed video playback issues on 10.4 builds
Fixed video playback issues on machines that do not support browser OpenGL acceleration
Fixed WebGL issues on 10.5 and 10.6 Intel builds
Fixed GitHub website issues through built-in Private Elements extension. Thank you to Private Elements developers for their contributions
Fixed various browser UI issues
Updated FFmpeg library to 7.1.5
Updated NSS security library to 3.90.13 (UXP)
Synced with UXP@ca36b1f452 for HTML, CSS, JavaScript engine improvements and security fixes
Addressed security vulnerabilities: CVE-2026-16353, CVE-2026-16408, CVE-2026-16389 and many others that do not have a CVE designation.

Thank you to everyone who has supported PowerFox’s development! This browser would not have been possible without your help. If you would like to help with continued development, please consider supporting PowerFox, which lets me acquire hardware for development, research further improvements for the browser, and work on future projects.

You can download a build from the download page.