Tab-Leiste auf der linken oder rechten Seite?

/* Tabs auf der linken Seite */


.tabbrowser-strip {
   -moz-box-orient: vertical; /* note: you can set this to -moz-scrollbars-vertical instead, but then the scrollbar will *always* be visible. this way there is never a scrollbar, so it behaves like the tab bar normally does */
   overflow: -moz-scrollbars-none;
}


.tabbrowser-tabs {
   min-width: 10ex; /* you may want to increase this value */
   -mox-box-pack: start;
   -moz-box-align: start;
   -moz-box-orient: horizontal;
}


.tabbrowser-tabs > hbox {
   -moz-box-align: stretch;
   -moz-box-orient: vertical;
   -moz-box-pack: start;
}


.tabbrowser-tabs > hbox > tab {
   -moz-box-align: start;
   -moz-box-orient: horizontal;
}


/* remove the close-tab button. trust me, you need to do this. */
.tabbrowser-tabs > stack {
   display: none;
}