diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index d8a452f3280..398e17741c2 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -2186,7 +2186,11 @@ pref("layout.css.scope-pseudo.enabled", true);
 pref("layout.css.background-blend-mode.enabled", true);
 
 // Is support for CSS vertical text enabled?
+#ifdef RELEASE_BUILD
 pref("layout.css.vertical-text.enabled", false);
+#else
+pref("layout.css.vertical-text.enabled", true);
+#endif
 
 // Is support for object-fit and object-position enabled?
 pref("layout.css.object-fit-and-position.enabled", true);