Tabs in two or more Rows (like TabMixPro) in Quantum?

I second this:

What I did was replace:

.tabbrowser-tab,.tab-background { height:var(–tab-min-height); }

with

.tabbrowser-tab,.tab-background { height:40px; }

and now it looks fine. The final contents of userChrome.css:

.tabbrowser-tab:not([pinned]) { flex-grow:1; min-width:150px; }
.tabbrowser-tab,.tab-background { height:40px; }
.tab-stack { width: 100%; }
#tabbrowser-tabs .scrollbox-innerbox { display: flex; flex-wrap: wrap; }
#tabbrowser-tabs .arrowscrollbox-scrollbox { overflow: visible; display: block; }
#main-window[sizemode=“maximized”] #TabsToolbar{ margin-left:var(–tab-min-height); }
#tabbrowser-tabs .scrollbutton-up,#tabbrowser-tabs .scrollbutton-down,#alltabs-button,.tabbrowser-tab:not([fadein]){ display: none; }
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