mobile-config-firefox/chrome/navbar_tabs_responsive_oneliner.css

/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/navbar_tabs_responsive_oneliner.css made available under Mozilla Public License v. 2.0
See the above repository for updates as well as full license text. */

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

/* Use page_action_buttons_on_hover.css to hide page-action-buttons to save more space for the address */

/* Toolbars will be shown normally if window width goes below the value below */



/* Modify it to suit your needs */
@media screen and (min-width: 1100px){
  
  :root[proton][uidensity="compact"]{ --proton-tab-block-margin: 2px !important; }
  
  /* Modify these to change relative widths or default height */
  #navigator-toolbox{
    --uc-navigationbar-width: 40vw;
    --uc-toolbar-height: 40px;
    --uc-urlbar-min-width: 50vw; /* minimum width for opened urlbar */
  }
  @media (-moz-proton){
    #scrollbutton-up,#scrollbutton-down{ border-block-width: 2px !important; }
  }
/* prevent urlbar overflow on narrow windows */
/* Dependent on how many items are in navigation toolbar ADJUST AS NEEDED */
  @media screen and (max-width: 1500px){
    #urlbar-container{ min-width:unset !important }
  }

  /* Override for other densities */
  :root[uidensity="compact"] #navigator-toolbox{ --uc-toolbar-height: 34px; }
  :root[uidensity="touch"] #navigator-toolbox{ --uc-toolbar-height: 44px; }

  #TabsToolbar{
    margin-left: var(--uc-navigationbar-width);
    --tabs-navbar-shadow-size: 0px;
  }
  #tabbrowser-tabs{
  --tab-min-height: calc(var(--uc-toolbar-height) - 2 * var(--proton-tab-block-margin,0px)) !important;
}
  
  /* This isn't useful when tabs start in the middle of the window */
  .titlebar-spacer[type="pre-tabs"]{ display: none }
  
  #navigator-toolbox > #nav-bar{
    margin-right:calc(100vw - var(--uc-navigationbar-width));
    margin-top: calc(0px - var(--uc-toolbar-height));
  }

  /* Window drag space  */
  :root[tabsintitlebar="true"] #nav-bar{ padding-left: 24px !important }

/* Rules specific to window controls on right layout */
  @supports -moz-bool-pref("layout.css.osx-font-smoothing.enabled"){
    .titlebar-buttonbox-container{ position: fixed; display: block; left: 0px; z-index: 3; }
    :root[tabsintitlebar="true"] #nav-bar{ padding-left: 96px !important; padding-right: 0px !important; }
  }

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

  /* Make opened urlbar overlay the toolbar */
  #urlbar[open]:focus-within{ min-width: var(--uc-urlbar-min-width,none) !important; }

  /* Hide dropdown placeholder */
  #urlbar-container:not(:hover) .urlbar-history-dropmarker{ margin-inline-start: -28px; }
  
}
/* Fix customization view */
#customization-panelWrapper > .panel-arrowbox > .panel-arrow{ margin-inline-end: initial !important; }