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

#urlbar[level="high"] > .autocomplete-textbox-container {
   background-color: #FFFFB7 !important;
}

#urlbar[level="broken"] > .autocomplete-textbox-container {
   background-color: #FFC0CB !important;
}