userchrome.css

/* Import your desired components first */
@import url(chrome/button_effect_scale_onclick.css);
@import url(chrome/hide_toolbox_top_bottom_borders.css);
@import url(chrome/minimal_text_fields.css);
/* @import url(chrome/custom_menupopup_check_icons.css);  */

/*Import hacks */
@import url(chrome/sideberyMods.css);
@import url(chrome/menuShow.css);
@import url(chrome/darkContextMenu.css);
@import url(chrome/sideberyModsLEFT.css);

:root {
  --tabs-border-color: transparent !important;
}

#urlbar,
#searchbar .searchbar-textbox {
  font-family: JetBrains Mono !important;
  font-size: 12pt;
}

#TabsToolbar,
#sidebar-header,
#sidebar-splitter {
  display: none;
}

/* note: if your minimize, exit, etc menu is gone, press alt, right click the menu bar and check mark it */