--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -716,17 +716,17 @@ pref("javascript.options.strict.debug", 
 pref("javascript.options.methodjit.content", true);
 pref("javascript.options.methodjit.chrome",  true);
 pref("javascript.options.ion.content",      true);
 pref("javascript.options.ion.parallel_compilation", false);
 pref("javascript.options.pccounts.content", false);
 pref("javascript.options.pccounts.chrome",  false);
 pref("javascript.options.methodjit_always", false);
 pref("javascript.options.xml.content", false);
-pref("javascript.options.xml.chrome", true);
+pref("javascript.options.xml.chrome", false);
 pref("javascript.options.jit_hardening", true);
 pref("javascript.options.typeinference", true);
 // This preference limits the memory usage of javascript.
 // If you want to change these values for your device,
 // please find Bug 417052 comment 17 and Bug 456721
 // Comment 32 and Bug 613551.
 pref("javascript.options.mem.high_water_mark", 128);
 pref("javascript.options.mem.max", -1);