-@media (-moz-mac-graphite-theme), (-moz-mac-lion-theme), (-moz-mac-yosemite-theme) {
- /* this is a usable workaround to detect we're on Mac OS */
- window {
- background-color:red !important;
- }
-}
-
-@media not (-moz-mac-graphite-theme), not (-moz-mac-lion-theme), not (-moz-mac-yosemite-theme) {