A fix for firefox title bar buttons when you want them to be on the left hand side.

userChrome.css

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

#titlebar-max {
  -moz-box-ordinal-group: 0;
}

#titlebar-content {
  direction: rtl;
}

#TabsToolbar {
  direction: rtl;
}

#tabbrowser-tabs {
  direction: ltr;
}

#titlebar-close {
  margin-right: 6px !important;
}