Simple CSS Hacks tips that Targeting Firefox
Firefox 2
html>/**/body .selector, x:-moz-any-link {
color:lime;
}
Firefox 3
html>/**/body .selector, x:-moz-any-link, x:default {
color:lime;
}
Any Firefox
@-moz-document url-prefix() {
.selector {
color:lime;
}
}