@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

.tabbrowser-tab[pinned][titlechanged]:not([selected="true"]):not(:hover) {
  background-image: -moz-linear-gradient(bottom, rgba(10%,10%,10%,.4) 1px, transparent 1px), -moz-linear-gradient(transparent, hsla(0,0%,45%,.1) 1px, hsla(0,0%,32%,.2) 80%, hsla(0,0%,0%,.2)),
                      -moz-linear-gradient( hsl(214,44%,87%),  hsl(214,44%,87%)) !important;
}

.tabbrowser-tab[pinned][titlechanged]:not([selected="true"]):hover {
  background-image: -moz-linear-gradient(bottom, rgba(10%,10%,10%,.4) 1px, transparent 1px), -moz-linear-gradient(hsla(0,0%,100%,.3) 1px, hsla(0,0%,75%,.2) 80%, hsla(0,0%,60%,.2)),
                      -moz-linear-gradient(hsl(214,44%,87%), hsl(214,44%,87%)) !important;
}