@-moz-document domain("facebook.com") {

.fbDock {
display: -moz-box !important;
position: fixed !important;
left: 0 !important;
}

#fbDockChat,
#fbDockChatTabSlider,
#fbDockChatBuddylistNub {
display: -moz-box !important;
-moz-transform: scalex(-1) !important;
}

}