en su corcel... nada, no se. firefox

.mozilla/firefox/mht30ivw.testing/chrome/userChrome.css

@@ -9,6 +9,7 @@
   /* border around url bar */
 }
 
+/* nav bar icons appear on hover */
 :root:not([customizing]) #nav-bar toolbarbutton {
   margin-left: -28px !important;
   opacity: 0 !important;
@@ -26,6 +27,11 @@
   pointer-events: auto !important;
 }
 
+:root:not([customizing]) #nav-bar #back-button, :root:not([customizing]) #nav-bar #forward-button {
+	display: none !important;
+}
+
+/* general dark theme stuff */
 :root[lwt-popup-brighttext] {
   --panel-separator-color: #212121 !important;
   border: none !important;
@@ -89,6 +95,7 @@ window#main-window {
   border: 1 solid #535c5c !important;
 }
 
+/* no tab close button */
 #tabbrowser-tabs .tabbrowser-tab .tab-close-button {
   display: none !important;
 }
@@ -196,6 +203,14 @@ tab {
 	transition-duration: 0.5s !important;
 }
 
+/* smaller scrollbars */
+.panel-subview-body,
+#permList,
+scrollbar{
+ color: inherit;
+ scrollbar-color: #383838 #212121;
+ scrollbar-width: thin 
+}
 
 /* chrome style open urlbar */
 #nav-bar {
@@ -247,7 +262,7 @@ display: none !important;
 
 .urlbarView-row
 {
-	padding: 0 16px !important;
+	padding: 0 18px !important;
 	height: 48px !important;
 	border-radius: 0 !important;
 	display: flex !important;
@@ -357,7 +372,7 @@ display: none !important;
 
 #urlbar-container
 {
-	max-height: 36px !important;
+	max-height: 37px !important;
 }
 
 #urlbar,
@@ -443,12 +458,6 @@ display: none !important;
 	height: 37px !important;
 }
 
-#urlbar[open] #identity-box
-{
-	margin-inline-start: 8px !important;
-	margin-inline-end: 8px !important;
-}
-
 .urlbarView
 {
 	top: 0 !important;
@@ -498,7 +507,6 @@ fill-opacity: 1 !important;
 color: inherit !important;
 opacity: 1 !important;
 padding: 0 !important;
-margin-inline-start: 8px !important;
 display: none !important;
 }
 
@@ -508,17 +516,6 @@ display: none !important;
 	padding: 0 !important;
 }
 
-#urlbar[pageproxystate=valid]:not([open]) #identity-box:-moz-any(.notSecureText, .verifiedIdentity, .chromeUI, .extensionPage, .certUserOverridden),
-#urlbar-label-box
-{
-	margin-inline-end: 8px !important;
-}
-
-#urlbar[pageproxystate=valid]:not([open]) #identity-box:-moz-any(.notSecureText, .verifiedIdentity, .chromeUI, .extensionPage, .certUserOverridden) #identity-icon-labels
-{
-	display: flex !important;
-}
-
 #urlbar[pageproxystate=valid] #identity-box:-moz-any(.notSecureText, .verifiedIdentity, .chromeUI, .extensionPage, .certUserOverridden):not(.no-hover):-moz-any([open], :hover) #identity-icon-labels::after
 {
 	opacity: 0 !important;
@@ -538,6 +535,12 @@ display: none !important;
 	color: #c94031 !important;
 }
 
+#identity-box[pageproxystate="invalid"] > #identity-icon {
+  list-style-image: url(chrome://branding/content/identity-icons-brand.svg) !important;
+  fill: orange !important;
+  fill-opacity: 1 !important; /* optional */
+}
+
 .urlbar-input
 {
 	padding: 0 !important;
@@ -570,32 +573,6 @@ display: none !important;
 background: 0 !important;
 }
 
-#tracking-protection-icon-box
-{
-transition:
-background-color .2s var(--ease-basic),
-width .15s var(--ease-in),
-opacity .15s var(--ease-basic),
-visibility 0s .2s !important;
-opacity: 0 !important;
-visibility: hidden !important;
-width: 0 !important;
-}
-
-#urlbar:hover #tracking-protection-icon-box,
-#tracking-protection-icon-container[open] #tracking-protection-icon-box,
-#tracking-protection-icon-box[active]
-{
-transition:
-background-color .2s var(--ease-basic),
-width .3s var(--ease-out),
-opacity .3s var(--ease-basic) !important;
-opacity: 1 !important;
-visibility: visible !important;
-width: 16px !important;
-}
-
-
 #identity-box #notification-popup-box
 {
 	padding: 0 !important;
@@ -605,8 +582,7 @@ width: 16px !important;
 .urlbar-icon:hover:not([disabled]),
 #page-action-buttons > toolbarbutton:hover:not([disabled]),
 .searchbar-search-button:hover,
-#identity-box:hover:not(.no-hover),
-#tracking-protection-icon-container:hover #tracking-protection-icon-box
+#identity-box:hover:not(.no-hover)
 {
 background-color: var(--toolbarbutton-hover-background) !important;
 }
@@ -616,8 +592,7 @@ background-color: var(--toolbarbutton-hover-background) !important;
 #page-action-buttons > toolbarbutton:hover:active:not([disabled]),
 .searchbar-search-button:hover:active,
 #identity-box:hover:active:not(.no-hover),
-#identity-box[open]:not(.no-hover),
-#tracking-protection-icon-container[open] #tracking-protection-icon-box
+#identity-box[open]:not(.no-hover)
 {
 background-color: var(--toolbarbutton-active-background) !important;
 transition-duration: 0 !important;
@@ -658,7 +633,7 @@ margin-inline-start: -32px !important;
 #pageActionButton,
 #pageAction-urlbar-screenshots_mozilla_org,
 #pageAction-urlbar-addSearchEngine),
-#tracking-protection-icon-container[open] ~ #page-action-buttons .urlbar-page-action:-moz-any(
+#page-action-buttons .urlbar-page-action:-moz-any(
 #pageActionButton,
 #pageAction-urlbar-screenshots_mozilla_org,
 #pageAction-urlbar-addSearchEngine)

.mozilla/firefox/mht30ivw.testing/chrome/userContent.css

@@ -2,14 +2,14 @@
     html:not(#ublock0-epicker), html:not(#ublock0-epicker) body, #newtab-customize-overlay {
       background: #121212 !important;
     }
+}
 
-  :root{
-    scrollbar-width: none !important;
-    }
-  }
+:root{ scrollbar-color: #383838 #212121  }
+*{ scrollbar-width: thin !important }
 
-  @-moz-document url(about:privatebrowsing) {
+
+@-moz-document url(about:privatebrowsing) {
     :root{
         scrollbar-width: none !important;
     }
-  }
+}