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Hide titlebar for mac firefox.
#titlebar .titlebar-buttonbox-container {
display: block;
position: fixed;
top: 0;
#titlebar .titlebar-spacer, #titlebar .toolbar-items {
visibility: collapse;
#titlebar {
height: 0;
min-height: 0;
#sidebar-header {
display: none;
toolbarspring {
min-width: 4px !important;
-moz-box-flex: 4;
toolbarspring:first-child {
min-width: 78px !important;
max-width: 186px !important;
-moz-box-flex: 78;
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