mobile-config-firefox/chrome/navbar_tabs_oneliner.css

/*Make tabs and navbar appear side-by-side tabs on right */

/* Modify these to change relative widths or default height */
#navigator-toolbox{
	--uc-navigationbar-width: 40vw;
	--uc-toolbar-height: 40px;
}
/* Override for other densities */
:root[uidensity="compact"] > #navigator-toolbox{ --uc-toolbar-height: 32px; }
:root[uidensity="touch"] > #navigator-toolbox{ --uc-toolbar-height: 40px; }

/* prevent urlbar overflow on narrow windows */
/* Dependent on how many items are in navigation toolbar ADJUST AS NEEDED */
@media screen and (max-width: 1100px){
  #urlbar-container{ min-width:unset !important }
}

#TabsToolbar{ margin-left: var(--uc-navigationbar-width); }
#tabbrowser-tabs{ --tab-min-height: var(--uc-toolbar-height) !important; }
/* This isn't useful when tabs start in the middle of the window */
.titlebar-placeholder[type="pre-tabs"],
.titlebar-spacer[type="pre-tabs"]{ display: none }
#nav-bar{
	margin-right:calc(100vw - var(--uc-navigationbar-width));
  margin-top: calc(0px - var(--uc-toolbar-height));
	padding-right: 0px !important;
}

/* Space to drag the window on left side of navbar */
:root[tabsintitlebar="true"]:not([inFullscreen]) #nav-bar{
  padding-left: var(--uc-window-drag-space-width,20px);
}

@supports -moz-bool-pref("layout.css.osx-font-smoothing.enabled"){
  :root:not([inFullscreen]) #nav-bar{
    padding-left: calc(var(--uc-window-control-width,72px) + var(--uc-window-drag-space-width,20px));
  }
  .titlebar-buttonbox-container{ position: fixed; left: 0px; z-index: 3; }
}

/* 1px margin on touch density causes tabs to be too high */
.tab-close-button{ margin-top: 0 !important }

/* Hide dropdown placeholder */
#urlbar-container:not(:hover) .urlbar-history-dropmarker{ margin-inline-start: -28px; }