Mozilla will enable JPEG XL image format by default across all Firefox 157 platforms. The move brings broader support for the next-generation image codec to mainstream browsers.
Firefox 157 will ship with JPEG XL enabled by default on desktop and mobile platforms. JPEG XL offers improved compression and image quality compared to legacy JPEG, supporting both lossy and lossless encoding.
The format provides significant file size reductions—typically 20-30% smaller than JPEG at equivalent quality. It also includes features like progressive decoding, better color handling, and transparency support.
JPEG XL has faced slow adoption despite technical advantages, partly due to limited browser support. Chrome disabled the feature in 2023 before reversing course. Safari added support in 2024.
Firefox's default enablement represents a significant step toward mainstream adoption. Web developers can now target the format without worrying about user browser compatibility, though fallbacks remain necessary for older Firefox versions and other browsers.
The change aligns with industry trends toward modernizing web image standards and reducing bandwidth consumption.
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