SUMMARYFirefox 158 now includes JPEG XL image support by default, making .jxl files a standard browser image format and adding image/jxl to Firefox’s default Accept header. The release also speeds up Smart Window form filling and adds CSS typed-arithmetic support, including calc() operations on same-type values with different units.
Firefox 158 is now available with JPEG XL image support enabled by default, making .jxl images a standard part of the browser rather than an experimental feature. The release also adds JPEG XL to Firefox's default image Accept header, improves Smart Window form filling, and brings new CSS typed-arithmetic support for developers. Phoronix reports: At long last, Firefox 158 is ready to go with JPEG-XL image support as an alternative to the likes of WebP, JPEG, PNG, and GIF. The default HTTP Accept header for image requests also now supports "image/jxl" for the JPEG-XL image format. Prior releases of Firefox had JPEG-XL gated by an experimental option.
Firefox 158 also now supports filling forms faster in Smart Window when clicking into a form field or selecting Fill from sources. On the developer side, CSS typed arithmetic are now supported to use functions like calc() to divide two values of the same data type even if of different units. Developer changes and release binaries can be found at their respective links.