diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/Global/decodeURI-decodes-FFFE-FFFF.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/Global/decodeURI-decodes-FFFE-FFFF.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 520095;
+var summary =
+  "decodeURI{,Component} should return the specified character for " +
+  "'%EF%BF%BE' and '%EF%BF%BF', not return U+FFFD";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+assertEq(decodeURI("%EF%BF%BE"), "\uFFFE");
+assertEq(decodeURI("%EF%BF%BF"), "\uFFFF");
+assertEq(decodeURIComponent("%EF%BF%BE"), "\uFFFE");
+assertEq(decodeURIComponent("%EF%BF%BF"), "\uFFFF");
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("All tests passed!");