--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -2902,21 +2902,17 @@ pref("layout.css.control-characters.visi
 #else
 pref("layout.css.control-characters.visible", true);
 #endif
 
 // Is support for column-span enabled?
 pref("layout.css.column-span.enabled", false);
 
 // Is effect of xml:base disabled for style attribute?
-#ifdef RELEASE_OR_BETA
-pref("layout.css.style-attr-with-xml-base.disabled", false);
-#else
 pref("layout.css.style-attr-with-xml-base.disabled", true);
-#endif
 
 // pref for which side vertical scrollbars should be on
 // 0 = end-side in UI direction
 // 1 = end-side in document/content direction
 // 2 = right
 // 3 = left
 pref("layout.scrollbar.side", 0);