Firefox 156 is out with faster start-up times for its built-in PDF viewer and lower CPU usage when viewing large JPEG images. This is the second release since Mozilla moved to a twice-monthly release schedule. 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 […]