Funny thing is even the Live USB browsing the image location in FF shows the same rendering issue. The default wallpapers display fine by comparison, or others on a data drive, for example. An odd thing, so if you find it good there I might redo the Live USB and edit to show result below over the weekend.*edit* Just checked it from the live USB, downloaded to pictures folder, and selected it, look fine on mine, is it just that image that does it or does the default ones do it eg. kingfisher?
*Edit: New live USB MX-16.1 64-bit tested on another PC (Dell) and monitor, once again finding a common issue in rendering gradients in particular images (found one background photo in collection that also has a funny rendering with a greyish gradient type sky area), I suspect the Live USB of MX-16.1 is somehow not rendering gradients as a desktop install does, in some cases. Why has me bemused, unless there's something missing, or some RAM saving or graphic rendering feature is somehow in play? The recent green background earlier in this thread also looks incorrect when running live, both when downloaded or simply viewed on the forum page with FF.. Scratches head but keep up the good work on the artwork

......the penny may drop eventually somewhere as to what I'm seeing, and why, in Live sessions. (The video is on-board in both Lenovo/Dell desktops Fwiw)