mobile-config-firefox/chrome/minimal_text_fields.css

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

:root:not([customizing]){
  --lwt-toolbar-field-background-color: transparent !important;
  --toolbar-field-border-color: transparent !important;
}

#urlbar[open]{ background-color: var(--toolbar-bgcolor) !important; }

#urlbar,
#searchbar,
#search-box{
  -moz-appearance: none !important;
  background-color: var(--lwt-toolbar-field-background-color) !important;
  color: inherit !important;
}

#searchbar,
#urlbar,
.searchbar-textbox{
  box-shadow: none !important;
}

#tracking-protection-icon-container,
#identity-box ~ *,
.searchbar-textbox > *{
  opacity: 0;
  transition: opacity 150ms linear
}

#urlbar .urlbar-input-box,
.searchbar-textbox > moz-input-box{ opacity: 0.6 }

#identity-box ~ *:hover,
#tracking-protection-icon-container:hover, 
#tracking-protection-icon-container ~ *:hover,
#urlbar:focus-within > *,
#urlbar-input-container:focus-within > *,
.searchbar-textbox:hover > *,
.searchbar-textbox:focus-within > *{ opacity: 1 }

#identity-box{ border: none !important }

#urlbar:not(:hover) #identity-box{ background-image: radial-gradient(closest-side circle at 16px, orange 10%,transparent 35% ); }
#urlbar:not(:hover) #identity-box.verifiedIdentity{ background-image: radial-gradient(closest-side circle at 16px, lime 10%,transparent 35% ); }
#urlbar:not(:hover) #identity-box > *{ opacity: 0 }
/*
:root[title="Firefox Nightly"] #identity-box,
:root[title="Mozilla Firefox"] #identity-box,
*/
#urlbar[pageproxystate=invalid]:not([usertyping]) #identity-box,
#identity-box:hover,
#identity-box.chromeUI,
#identity-box.verifiedDomain{
  background-image: none !important;
}

#identity-box > #identity-icon-labels{ transition: max-width 150ms linear !important; }
#identity-box:not(:hover) > #identity-icon-labels{ max-width: 0px !important; }