Index: src/org/openstreetmap/josm/plugins/flatlaf/FlatLightLaf.properties
===================================================================
--- src/org/openstreetmap/josm/plugins/flatlaf/FlatLightLaf.properties	(nonexistent)
+++ src/org/openstreetmap/josm/plugins/flatlaf/FlatLightLaf.properties	(working copy)
@@ -0,0 +1,5 @@
+#
+# License: GPL. For details, see LICENSE file.
+#
+
+TabbedPane.selectedBackground=darken($TabbedPane.background,5%,derived)
Index: src/org/openstreetmap/josm/plugins/flatlaf/FlatDarkLaf.properties
===================================================================
--- src/org/openstreetmap/josm/plugins/flatlaf/FlatDarkLaf.properties	(revision 35654)
+++ src/org/openstreetmap/josm/plugins/flatlaf/FlatDarkLaf.properties	(working copy)
@@ -2,6 +2,10 @@
 # License: GPL. For details, see LICENSE file.
 #
 
+TabbedPane.selectedBackground=darken($TabbedPane.background,5%,derived noAutoInverse)
+TabbedPane.hoverColor=darken($TabbedPane.background,7%,derived noAutoInverse)
+
+
 #---- NamedColorProperty ----
 
 # AbstractTextComponentValidator