Add drag-space support

chrome/hide_tabs_with_one_tab.css

@@ -1,6 +1,10 @@
 /* Makes tabs toolbar items zero-height initially and sets enlarge them to fill up space equal to tab-min-height set on tabs */
 /* Firefox 65+ only */
 /* !!USER!! -  REMOVE ALL BUTTONS you can from the tabs toolbar */
+
+/* Configurable window drag space  */
+:root[sizemode="normal"] #nav-bar{ --window-drag-space-width: 20px }
+
 #titlebar{ -moz-appearance: none !important; }
 #tabbrowser-tabs, #tabbrowser-tabs > .tabbrowser-arrowscrollbox{ min-height: 0 !important; }
 :root:not([customizing]) #tabbrowser-tabs .tabs-newtab-button,
@@ -31,4 +35,5 @@
   min-height: initial !important;
   height: initial !important;
   -moz-appearance: initial !important;
-}
+}
+#nav-bar{ padding: 0 var(--window-drag-space-width,0px) }