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chrome/extras/hidetoolbarbuttons.css

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+/* (BUGGY: USE AT OWN RISK!) Hide toolbar buttons other than extensions */
+
+.toolbarbutton-icon,
+.toolbarbutton-badge-stack,
+#nav-bar .toolbarbutton-1
+{
+    transition-duration: 0.1s !important;
+    transition-property: width, padding, border !important;
+}
+:root:not([customizing]) #navigator-toolbox:not(:hover) > #nav-bar:not([urlbar-exceeds-toolbar-bounds="true"]) .toolbarbutton-1:not(.webextension-browser-action, [open], [checked]) :-moz-any(.toolbarbutton-icon, .toolbarbutton-badge-stack)
+{
+    width: 0 !important; padding: 0 !important;
+}
+:root:not([customizing]) #navigator-toolbox:not(:hover) > #nav-bar:not([urlbar-exceeds-toolbar-bounds="true"]) .toolbarbutton-1:not(.webextension-browser-action, [open], [checked])
+{
+    border-width: 0 !important;
+}
+
+/* Also Hide urlbar background */
+/*
+:root:not([customizing]) #navigator-toolbox:not(:hover) > #nav-bar
+{ --toolbar-field-background-color: transparent !important; }
+*/

chrome/extras/swapaccount-overflow.css

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+/* (BUGGY: USE AT OWN RISK!) Swap Account icon and Overflow icon (must be placed next to each other) */
+
+@media (min-width: 687px) {
+    :root:not([customizing]) #nav-bar-overflow-button
+    {
+        transform: translateX(-44px);
+    }
+    :root:not([customizing]) #fxa-toolbar-menu-button
+    {
+        transform: translateX(44px);
+    }
+}

chrome/extras/vibrancy.css

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+/* (MACOS ONLY!) Enable window vibrancy behind tabs */
+
+#TabsToolbar:not(:-moz-window-inactive)
+{
+    background-color: #0001 !important;
+}
+#main-window:-moz-any([lwthemetextcolor="bright"], [privatebrowsingmode=temporary]) #TabsToolbar:not(:-moz-window-inactive)
+{
+    background-color: #1114 !important;
+}
+
+#main-window
+{
+    -moz-appearance: -moz-mac-vibrant-titlebar-light !important;
+}
+
+#main-window:-moz-any([lwthemetextcolor="bright"], [privatebrowsingmode=temporary])
+{
+    -moz-appearance: -moz-mac-vibrant-titlebar-dark !important;
+}
+
+:-moz-any(#main-window, #TabsToolbar):-moz-any([inFullscreen="true"], :-moz-window-inactive)
+{
+    -moz-appearance: none !important;
+    background-color: var(--lwt-accent-color) !important;
+}