Image scaling is handled differently by different browsers, and there is no official way to indicate how these images scale.
However, Firefox 3.6 and above will let you specify image-renderingin CSS. You can enable it with this CSS:
img {
image-rendering: -moz-crisp-edges;
}
See the image-rendering article on the Mozilla website for more details - this also applies to “background images of any element” that sounds like you.
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