I added class="active" to the tabs function. With this class each kind of tab has a special class and so the hover effect can be applied only to normal tabs, not to the selected and not to the inactive ones. I think it is a better signal for the user to get feedback for those tabs only which will react and change something on a click.

The behavior of the existing tabs in "standard" are not affected.

lib/weblib.php

@@ -4160,6 +4160,10 @@ class tabobject {
     /// Set the class for the selected cell
         } else if ($selected) {
             $cstr .= ' selected';
+            
+    /// Set the standard class for a cell
+        } else {
+            $cstr .= ' active';
         }