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

/* Tab Color Underscoring active/read/unread (DM) */
/* ===================================================== */

/* leaving background  and focus rings alone so that background color
   for Perma Tabs extension will prevail, but prefer Flat tabs usages */

/* Change underline color of active tab  - RED */
tab[selected="true"] {
   border-left: solid 1px #FF0000   !important;
   border-bottom: solid 2px #FF0000   !important;
   color: #000000 !important; }

/* Change underline color of normal tabs  - BLUE */
tab:not([selected="true"]) {
   border-left: solid 1px #0066CC   !important;
   border-right: solid 1px  !important;
   border-bottom: 2px solid #0066CC   !important;
   color: black !important; }

/* Change text and underline color of unread tabs - GREEN */
/* http://kb.mozillazine.org/Change_the_style_of_tab_markers */
 #content tab:not([selected]) {
  color: #005500 !important;
  border-bottom: 2px solid #00BB00  !important;}