I want to specify two slightly different background colors, one for Mac OS, one for Windows.
Older versions of Firefox could also detect windows (for those who are not using autoupdate) and are using version 4 or newer. It is more basic and does not tell the version, just the fact you are in windows. I created this one for testing a while back because I was curious.
@media screen and (-moz-windows-theme) {
body {
background-color: white;
}
}
this is also covered in https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Media_queries