diff --git a/src/other/firefox/Monterey/parts/tabsbar-alt.css b/src/other/firefox/Monterey/parts/tabsbar-alt.css
index 199b2151..c23c2d54 100644
--- a/src/other/firefox/Monterey/parts/tabsbar-alt.css
+++ b/src/other/firefox/Monterey/parts/tabsbar-alt.css
@@ -58,27 +58,27 @@ tab > stack {
 	margin-block: 0 !important;
 }
 
-.tab-background:not([selected=true]) {
+#TabsToolbar .tabbrowser-tab:not([selected=true]) .tab-background {
 	background: var(--gnome-tabbar-tab-background) !important;
 }
 
-.tab-background:not([selected=true]):-moz-window-inactive {
+#TabsToolbar .tabbrowser-tab:not([selected=true]) .tab-background:-moz-window-inactive {
 	background: var(--gnome-inactive-tabbar-tab-background) !important;
 }
 
 /* Tab hover */
-#TabsToolbar .tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true]) {
+#TabsToolbar .tabbrowser-tab:not([selected=true]):hover > .tab-stack > .tab-background {
 	background: var(--gnome-tabbar-tab-hover-background) !important;
 }
 
 /* Active tab */
-.tab-background[selected=true] {
+.tab-background:is([selected]) {
 	background: var(--gnome-tabbar-tab-active-background) !important;
 	animation: none !important;
 	transition: none !important;
 }
 
-.tab-background[selected=true]:-moz-window-inactive {
+.tab-background:is([selected]):-moz-window-inactive {
 	background: var(--gnome-inactive-tabbar-tab-active-background) !important;
 }
 
diff --git a/src/other/firefox/Monterey/parts/tabsbar.css b/src/other/firefox/Monterey/parts/tabsbar.css
index 10cc3596..a525eee2 100644
--- a/src/other/firefox/Monterey/parts/tabsbar.css
+++ b/src/other/firefox/Monterey/parts/tabsbar.css
@@ -36,25 +36,25 @@ tab > stack {
 	transition: background 200ms !important;
 }
 
-.tab-background:not([selected=true]) {
+#TabsToolbar .tabbrowser-tab:not([selected=true]) .tab-background {
 	background: var(--gnome-tabbar-tab-background) !important;
 }
 
-.tab-background:not([selected=true]):-moz-window-inactive {
+#TabsToolbar .tabbrowser-tab:not([selected=true]) .tab-background:-moz-window-inactive {
 	background: var(--gnome-inactive-tabbar-tab-background) !important;
 }
 
 /* Tab hover */
-#TabsToolbar .tabbrowser-tab:hover > .tab-stack > .tab-background:not([selected=true]) {
+#TabsToolbar .tabbrowser-tab:not([selected=true]):hover .tab-background {
 	background: var(--gnome-tabbar-tab-hover-background) !important;
 }
 
 /* Active tab */
-.tab-background[selected=true] {
+.tab-background:is([selected]) {
 	background: var(--gnome-tabbar-tab-active-background) !important;
 }
 
-.tab-background[selected=true]:-moz-window-inactive {
+.tab-background:is([selected]):-moz-window-inactive {
 	background: var(--gnome-inactive-tabbar-tab-active-background) !important;
 }
 
diff --git a/src/other/firefox/Monterey/parts/toolbox-alt.css b/src/other/firefox/Monterey/parts/toolbox-alt.css
index 5275f77e..d25eda7c 100644
--- a/src/other/firefox/Monterey/parts/toolbox-alt.css
+++ b/src/other/firefox/Monterey/parts/toolbox-alt.css
@@ -86,12 +86,18 @@ findbar:-moz-window-inactive {
 }
 
 /* Sidebar */
-#sidebar-box,
+#sidebar-box, #sidebar,
 .sidebar-panel[lwt-sidebar] {
 	color: var(--gnome-toolbar-color) !important;
 	background: var(--gnome-toolbar-background) !important;
 }
 
+.sidebar-splitter {
+	width: 1px !important;
+	background-color: var(--gnome-toolbar-border-color) !important;
+	border: none !important;
+}
+
 /* Customization page */
 #customization-container:-moz-lwtheme {
 	background-image: linear-gradient(var(--gnome-browser-before-load-background), var(--gnome-browser-before-load-background)) !important;
diff --git a/src/other/firefox/Monterey/parts/toolbox.css b/src/other/firefox/Monterey/parts/toolbox.css
index 2eb03362..e35317ce 100644
--- a/src/other/firefox/Monterey/parts/toolbox.css
+++ b/src/other/firefox/Monterey/parts/toolbox.css
@@ -97,12 +97,18 @@ findbar:-moz-window-inactive,
 }
 
 /* Sidebar */
-#sidebar-box,
+#sidebar-box, #sidebar,
 .sidebar-panel[lwt-sidebar] {
 	color: var(--gnome-toolbar-color) !important;
 	background: var(--gnome-toolbar-background) !important;
 }
 
+.sidebar-splitter {
+	width: 1px !important;
+	background-color: var(--gnome-toolbar-border-color) !important;
+	border: none !important;
+}
+
 /* Customization page */
 #customization-container:-moz-lwtheme {
 	background-image: linear-gradient(var(--gnome-browser-before-load-background), var(--gnome-browser-before-load-background)) !important;