diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug690959.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug690959.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+var s = 'abcdFF0123456789012345fail';
+s = s.replace("abcd", "0123456789012345678901234567890123456789012FF");
+s = s.replace("FF0123456789012345fail", "ok");
+assertEq(s, '0123456789012345678901234567890123456789012FFok');