Mozilla has enabled native support for the JPEG XL image format in Firefox version 158, released on October 12, 2026. The browser now includes the image/jxl parameter in its HTTP Accept header to signal compatibility to web servers.
JPEG XL is a royalty-free format designed to replace JPEG and WebP. It supports lossy and lossless compression, transparency, animation, and HDR. It offers up to 60% better compression efficiency than standard JPEG.
The format was standardized in 2022 after development began in 2018. While Google previously removed JPEG XL support from Chromium in 2022, it reintroduced it in 2026 via an experimental flag in version 145, using a Rust-based decoder.
Other browsers, including Microsoft Edge from version 155 and Brave from version 1.97.56, have also implemented support. Additionally, Microsoft added JPEG XL support to Windows 11 in March 2025 via a free store extension.
As of September 2026, Firefox holds a 2.8% share of the global browser market, trailing Chrome at 66.36%, Safari at 18.27%, and Edge at 6.04%. In the desktop segment, Firefox accounts for 6.11% of the market.
