diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/debug/Frame-onPop-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/debug/Frame-onPop-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+// Clearing a frame's onPop handler works.
+var g = newGlobal();
+g.eval("function f() { debugger; }");
+var dbg = new Debugger(g);
+
+var log;
+dbg.onEnterFrame = function handleEnter(f) {
+    log += "(";
+    f.onPop = function handlePop() {
+        assertEq("handlePop was called", "handlePop should never be called");
+    };
+};
+dbg.onDebuggerStatement = function handleDebugger(f) {
+    log += "d";
+    assertEq(typeof f.onPop, "function");
+    f.onPop = undefined;
+};
+log = '';
+g.f();
+assertEq(log, "(d");