To make the tabs line up vertically on the left side of the window add to <i>chrome/userChrome.css:</i><font size="1"> (in your /home/xxx/.mozilla/firefox/xxxxxxx.default/chrome/userChrome.css )</font>
Just create a plain text document and save it as userChrome.css and place it in the above chrome folder.
<code language="">#content > tabbox { -moz-box-orient: horizontal; }
.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 { -moz-box-orient: horizontal; /* min-width: 50ex; */ /* >1680 pixels screens */ /* min-width: 40ex; */ /* =1680,1600 pixels screens */ /* min-width: 35ex; */ /* =1440 pixels screens */ /* min-width: 30ex; */ /* <1440 pixels screens */ min-width: 20ex; /* 1280 pixels screens */ /* min-width: 17ex; */ /* this is almost the minimum to go down to on small screens */ -moz-box-align: start; }
/* Background for tabbrowser strip */ tabs.tabbrowser-tabs { background-color: grey !important; }
.tabbrowser-tabs > stack > vbox > hbox > hbox { -moz-box-orient: vertical; -moz-box-align: stretch; }
.tabbrowser-tabs > stack > vbox > hbox > hbox > tab { -moz-box-align: start; -moz-box-orient: horizontal; }
/* to put the tabs on the right un-comment this line (not needed if using Tab Mix Plus) */ #content > tabbox {-moz-box-direction: reverse;}</code>