@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
.tabbrowser-tab[busy] .tab-icon-image {
background-color: #c6d3de !important;
border: 1px solid !important;
border-color: #c6d3de !important;
-moz-border-radius: 8px !important;
}