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

tab:not([pinned]) .tab-icon,
tab:not([pinned]) .tab-close-button,
.tabbrowser-tab:not([pinned]) .tab-reload-icon,
.tabbrowser-tab:not([pinned]) .tab-protect-icon,
.tabbrowser-tab:not([pinned]) .tab-lock-icon 
{ -moz-box-ordinal-group:2 !important; }

.tabbrowser-tabs *|tab 
{ font-size: 12px !important;
min-width: 21px !important;
max-width: 21px !important; }

tab:not([busy]) .tab-close-button 
{ visibility: collapse !important; }

tab:not([pinned]):hover .tab-close-button 
{ visibility: visible !important; 
margin-right: 4px !important;
width: 17px !important; }

tab:not([pinned]) .tab-icon .tab-icon-image 
{ margin-left: 0 !important;
margin-right: 3px !important; }

tab:not([pinned])[busy] .tab-icon,
tab:not([pinned]):hover .tab-icon { visibility: collapse !important; }