diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index f7da317..35e3b49 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -12774,6 +12774,12 @@
       #toolbar-context-undoCloseTab {
         --menuitem-image: url("../icons/undo.svg");
       }
+      #toolbar-context-customize-sidebar {
+        --menuitem-image: url("chrome://browser/skin/customize.svg");
+      }
+      #toolbar-context-toggle-vertical-tabs {
+        --menuitem-image: url("chrome://browser/skin/sidebar-collapsed.svg");
+      }
       #toggle_toolbar-menubar {
         /* checkbox */
         --menuitem-image: url("../icons/calendar-agenda.svg");
@@ -28384,6 +28390,16 @@
     --menuitem-image: url("../icons/undo.svg");
   }
 }
+@media (not (-moz-bool-pref: "userChrome.icon.disabled")) and (-moz-bool-pref: "userChrome.icon.menu") and (-moz-bool-pref: "userChrome.icon.context_menu") {
+  #toolbar-context-customize-sidebar {
+    --menuitem-image: url("chrome://browser/skin/customize.svg");
+  }
+}
+@media (not (-moz-bool-pref: "userChrome.icon.disabled")) and (-moz-bool-pref: "userChrome.icon.menu") and (-moz-bool-pref: "userChrome.icon.context_menu") {
+  #toolbar-context-toggle-vertical-tabs {
+    --menuitem-image: url("chrome://browser/skin/sidebar-collapsed.svg");
+  }
+}
 @media (not (-moz-bool-pref: "userChrome.icon.disabled")) and (-moz-bool-pref: "userChrome.icon.menu") and (-moz-bool-pref: "userChrome.icon.context_menu") {
   #toggle_toolbar-menubar {
     /* checkbox */
diff --git a/css/leptonChromeESR.css b/css/leptonChromeESR.css
index e194361..e733ff3 100644
--- a/css/leptonChromeESR.css
+++ b/css/leptonChromeESR.css
@@ -13452,6 +13452,12 @@
       #toolbar-context-undoCloseTab {
         --menuitem-image: url("../icons/undo.svg");
       }
+      #toolbar-context-customize-sidebar {
+        --menuitem-image: url("chrome://browser/skin/customize.svg");
+      }
+      #toolbar-context-toggle-vertical-tabs {
+        --menuitem-image: url("chrome://browser/skin/sidebar-collapsed.svg");
+      }
       #toggle_toolbar-menubar {
         /* checkbox */
         --menuitem-image: url("../icons/calendar-agenda.svg");
diff --git a/src/icons/context_menu/_tab_toolbar.scss b/src/icons/context_menu/_tab_toolbar.scss
index c8204ea..276bb83 100644
--- a/src/icons/context_menu/_tab_toolbar.scss
+++ b/src/icons/context_menu/_tab_toolbar.scss
@@ -218,6 +218,13 @@
   --menuitem-image: url("../icons/undo.svg");
 }
 
+#toolbar-context-customize-sidebar {
+  --menuitem-image: url("chrome://browser/skin/customize.svg");
+}
+#toolbar-context-toggle-vertical-tabs {
+  --menuitem-image: url("chrome://browser/skin/sidebar-collapsed.svg");
+}
+
 #toggle_toolbar-menubar {
   /* checkbox */
   --menuitem-image: url("../icons/calendar-agenda.svg");