Firefox 156 reduces CPU usage when viewing JPGs

Firefox 156 is out with faster start-up times for its built-in PDF viewer and lower CPU usage when viewing large JPEG images. As you browse the web you (pretty much always) see images smaller than their native resolution. To wit, if I embed a 4K JPEG in this post, for example, you don’t see it at full size: it’s downscaled to fit on the page. Same amount of pixel data, but squeezed by CSS. In Firefox 156, the browser now uses libjpeg-turbo’s IDCT scaling to reduce images during decoding, rather than loading a full-size image into memory and then shrinking […]
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https://www.omgubuntu.co.uk/2026/09/firefox-156-released