1 files changed, 11 insertions, 1 deletions
diff --git a/browser/themes/ThemeVariableMap.sys.mjs b/browser/themes/ThemeVariableMap.sys.mjs
index c0c9042efc..1795bfe7c1 100644
--- a/browser/themes/ThemeVariableMap.sys.mjs
+++ b/browser/themes/ThemeVariableMap.sys.mjs
@@ -56,12 +56,22 @@ export const ThemeVariableMap = [
     },
   ],
   [
-    "--tabs-navbar-shadow-color",
+    "--tabs-navbar-separator-color",
     {
       lwtProperty: "toolbar_top_separator",
     },
   ],
   [
+    "--tabs-navbar-separator-style",
+    {
+      lwtProperty: "toolbar_top_separator",
+      processColor(rgbaChannels) {
+        // If the separator is transparent, we don't want it to take space.
+        return rgbaChannels?.a === 0 ? "none" : null;
+      },
+    },
+  ],
+  [
     "--toolbarseparator-color",
     {
       lwtProperty: "toolbar_vertical_separator",