My CSS Code

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

/* Modify to change window drag space width */
/*
Use tabs_on_bottom_menubar_on_top_patch.css if you
have menubar permanently enabled and want it on top
 */

/* IMPORTANT */
/*
Get window_control_placeholder_support.css
Window controls will be all wrong without it.
Additionally on Linux, you may need to get:
linux_gtk_window_control_patch.css
*/

radiogroup:focus-visible > radio[focused="true"] > .radio-label-box {
  outline: 1px dotted black !important;
}

:root{ --toolbar-field-focus-border-color: transparent !important; }

:root{ --uc-titlebar-padding: 10px; }
@media  (-moz-os-version: windows-win7),(-moz-os-version: windows-win10){
  :root[sizemode="maximized"][tabsintitlebar]{ --uc-titlebar-padding: 8px }
}
#alltabs-button { display: none !important; }
#toolbar-menubar[autohide="true"] > .titlebar-buttonbox-container,
#TabsToolbar > .titlebar-buttonbox-container{
  position: fixed;
  display: block;
  top: var(--uc-titlebar-padding,0px);
  right:0;
  height: 40px;
}
/* Mac specific. You should set that font-smoothing pref to true if you are on any platform where window controls are on left */
@supports -moz-bool-pref("layout.css.osx-font-smoothing.enabled"){
  :root{ --uc-titlebar-padding: 0px !important }
  .titlebar-buttonbox-container{ left:0; right: unset !important; }
}

:root[uidensity="compact"] #TabsToolbar > .titlebar-buttonbox-container{ height: 32px }

#toolbar-menubar[inactive] > .titlebar-buttonbox-container{ opacity: 0 }

#navigator-toolbox{ padding-top: var(--uc-titlebar-padding,0px) !important; }

.titlebar-buttonbox-container > .titlebar-buttonbox{ height: 100%; }

#titlebar{
  order: 2;
  -moz-appearance: none !important;
  --tabs-navbar-shadow-size: 0px;
}

#unified-extensions-button{
display: none !important;
}

.titlebar-placeholder,
#TabsToolbar .titlebar-spacer{ display: none; }
/* Also hide the toolbox bottom border which isn't at bottom with this setup */
#navigator-toolbox::after{ display: none !important; }

@media (-moz-gtk-csd-close-button){ .titlebar-button{ flex-direction: column; } }

/* These exist only for compatibility with autohide-tabstoolbar.css */
toolbox#navigator-toolbox > toolbar#nav-bar.browser-toolbar{ animation: none; }
#navigator-toolbox:hover #TabsToolbar{ animation: slidein ease-out 48ms 1 }

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

/* Menubar on top patch - use with tabs_on_bottom.css */
/* Only really useful if menubar is ALWAYS visible */

:root:not([sizemode="fullscreen"]){ --uc-window-control-width: 0px !important }

:root{
   /* height if native titlebar is enabled, assumes empty menubar */
  --uc-menubar-height: 22px;
}
:root[tabsintitlebar]{
  /* height when native titlebar is disabled, more roomy so can fit buttons etc. */
  --uc-menubar-height: 22px;
}

#navigator-toolbox{ padding-top: calc(var(--uc-menubar-height) + var(--uc-titlebar-padding,0px)) !important }
:root[sizemode="fullscreen"] #navigator-toolbox{ padding-top: 0px !important; }
#toolbar-menubar{
  position: fixed;
  display: flex;
  top: var(--uc-titlebar-padding,0px);
  height: var(--uc-menubar-height);
  width: 100%;
  overflow: hidden;
}

#toolbar-menubar > .titlebar-buttonbox-container{ height: 100%; order: 100; }

#toolbar-menubar > [flex]{ flex-grow: 100; }
#toolbar-menubar > spacer[flex]{
  order: 99;
  flex-grow: 1;
  min-width: var(--uc-window-drag-space-width,20px);
}

#toolbar-menubar .titlebar-button{ padding: 2px 17px !important;  }

#toolbar-menubar .toolbarbutton-1 { --toolbarbutton-inner-padding: 3px }

/* remove padding in bookmarks menu */
menupopup > menuitem, menupopup > menu {
padding-block: 1.4px !important;
}

.openintabs-menuitem {
display: none !important;
}

.bookmarks-actions-menuseparator {
  display:none !important;
}

/* Status-bar */
#main-window:not([inFullscreen="true"]) > body::after{
  display: flex;
  content: "";
  height: 24px;
  border-top: solid 0px #505050;
}
.browserContainer>statuspanel { left: 4px !important; bottom: 0px; transition-duration: 0s !important; transition-delay: 0s !important; }
.browserContainer>statuspanel>.statuspanel-inner>.statuspanel-label { margin-left: 0px !important; border: none !important; padding: 0px !important; }

window[inFullscreen="true"] #browser-bottombox { display:none !important; }
window[inFullscreen="true"] .browserContainer>statuspanel[type="overLink"] .statuspanel-label { display:none !important; }

#statuspanel #statuspanel-label {
-moz-appearance: none !important;
background-color: transparent !important;
border: 0px solid black !important;
padding-top: 22px !important;
}

#statuspanel {
background-color: transparent !important;
border: none !important;
bottom: 20px !important; /* adjust*/
height: 20px !important; /* adjust */
max-width: 30% !important; /* Change the value to suite your needs */
transition: none !important;
position: fixed !important;
}

#PopupAutoCompleteRichResult {

  display: none!important;

}}
/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/tabs_on_bottom_v2.css made available under Mozilla Public License v. 2.0
See the above repository for updates as well as full license text. */

/* This reorders toolbar to place tabs below other toolbars. Requires Firefox 133+ */

@media (-moz-bool-pref: "userchrome.force-window-controls-on-left.enabled"),
       -moz-pref("userchrome.force-window-controls-on-left.enabled"){
  #nav-bar > .titlebar-buttonbox-container{
    order: -1 !important;
    > .titlebar-buttonbox{
      flex-direction: row-reverse;
    }
  }
}
@media not (-moz-bool-pref: "sidebar.verticalTabs"),
       not -moz-pref("sidebar.verticalTabs"){
  .global-notificationbox,
  #tab-notification-deck,
  #TabsToolbar{
    order: 1;
  }
  #TabsToolbar > :is(.titlebar-spacer,.titlebar-buttonbox-container){
    display: none;
  }
  :root[sizemode="fullscreen"] #nav-bar > .titlebar-buttonbox-container{
    display: flex !important;
  }
  :root:is([tabsintitlebar],[customtitlebar]) #toolbar-menubar:not([autohide="false"]) ~ #nav-bar{
    > .titlebar-buttonbox-container{
      display: flex !important;
    }
    :root[sizemode="normal"] & {
      > .titlebar-spacer{
        display: flex !important;
      }
    }
    :root[sizemode="maximized"] & {
      > .titlebar-spacer[type="post-tabs"]{
        display: flex !important;
      }
      @media (-moz-bool-pref: "userchrome.force-window-controls-on-left.enabled"),
        -moz-pref("userchrome.force-window-controls-on-left.enabled"),
        (-moz-gtk-csd-reversed-placement),
        (-moz-platform: macos){
        > .titlebar-spacer[type="post-tabs"]{
          display: none !important;
        }
        > .titlebar-spacer[type="pre-tabs"]{
          display: flex !important;
        }
      }
    }
  }
}