userchrome.css

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

toolbarbutton#alltabs-button {
    -moz-binding: url("userChrome.xml#js");
}


#titlebar {margin-bottom: -22px !important;}
#tabbrowser-tabs {visibility: collapse !important;}

#titlebar-buttonbox {
  position: relative !important;
  overflow-x: hidden !important;
  height: 10px !important;
  -moz-transition: all .2s ease-out .2s !important;
}

#titlebar-buttonbox:hover {
  margin-top: -15px !important;
  margin-bottom: 5px !important;
  height: 60px !important;
}


[privatebrowsingmode="temporary"] #titlebar {margin-bottom: -22px !important;}
[privatebrowsingmode="temporary"] #tabbrowser-tabs {visibility: collapse !important;}

[privatebrowsingmode="temporary"] #titlebar-buttonbox {
  position: relative !important;
  overflow-x: hidden !important;
  height: 10px !important;
  -moz-transition: all .2s ease-out .2s !important;
}
[privatebrowsingmode="temporary"] #titlebar-buttonbox:hover {
  margin-top: -15px !important;
  margin-bottom: 5px !important;
  height: 60px !important;
}

[privatebrowsingmode="temporary"] #TabsToolbar {
    visibility: collapse !important;
}
[privatebrowsingmode="temporary"] #titlebar-spacer {
  background-image: url("chrome://browser/skin/private-browsing.svg");
  background-repeat: no-repeat;
  background-position: right;
}

#sidebar-header { display: none; }