mobile-config-firefox/chrome/urlbar_popup_full_width.css

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

/* Make urlbar popup appear full size like it did before urlbar re-design */

/* Temporary dummy variables, can probably be removed when Fx92 releases */
:root{
  --toolbar-field-background-color: var(--toolbar-field-non-lwt-bgcolor);
  --toolbar-field-focus-background-color: var(--lwt-toolbar-field-focus,Field);
}
:root:-moz-lwtheme{
  --toolbar-field-background-color: var(--lwt-toolbar-field-background-color);
}

.urlbarView-row-inner{
   /* This sets how far the dropdown-items are from window edge */
  padding-inline-start: 6px !important;
}

#urlbar-container,
#urlbar{
  position: static !important;
  display: flex !important;
}
#urlbar{
  height: auto !important;
  width: auto !important;
  box-shadow: inset 0 0 0 1px var(--toolbar-field-border-color, hsla(240,5%,5%,.25));
  background-color: var(--toolbar-field-background-color, hsla(0,0%,100%,.8));
  border-radius: var(--toolbarbutton-border-radius);
  --uc-urlbar-min-width: none; /* navbar_tabs_oneliner.css compatibility */
}

#urlbar,
#urlbar-background,
#urlbar-input-container,
.urlbarView{
  flex-grow: 1; /* Fx <112 compatibility */
}

#urlbar[focused]{ box-shadow: inset 0 0 0 1px var(--toolbar-field-focus-border-color, highlight); }

.urlbarView{
  position: absolute !important;
  margin: 0 !important;
  left: 0 !important;
  width: 100vw !important;
  border-width: 1px 0;
  top: var(--urlbar-toolbar-height);
  background-color: var(--toolbar-field-focus-background-color, inherit);
  z-index: 4;
  box-shadow: 0 1px 4px rgba(0,0,0,.05);
}

#urlbar > #urlbar-input-container{ padding: 0px !important; width: auto !important; height: auto !important; }
#urlbar > #urlbar-background{ display: none !important; }

/* This may seem pretty weird, but it gets around an issue where the height of urlbar may suddenly change when one starts typing into it */
/* If you are otherwise modifying the urlbar height then you might need to modify the height of this too */
#urlbar > #urlbar-input-container::before{ content: ""; display: flex; height: 24px; }