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```css
#titlebar {
appearance: none !important;
height: 0px;
}

#titlebar>#toolbar-menubar {
margin-top: 0px;
}

#TabsToolbar {
height: 0px !important;
display: none;
min-width: 0 !important;
min-height: 0 !important;
}

#TabsToolbar>.titlebar-buttonbox-container {
display: block;
position: absolute;
top: 0px;
left: 0px;
}
```