The Tor Browser / file revision

 // When an exception is propagated out of multiple frames, their onPop

 // and onExceptionUnwind handlers are called in the correct order.

 var g = newGlobal();

 g.eval("function f() { throw 'mud'; }");

 g.eval("function g() { f(); }");

 g.eval("function h() { g(); }");

 g.eval("function i() { h(); }");

 var dbg = new Debugger(g);

 var log;

 function makePopHandler(label) {

     return function handlePop(completion) { 

         log += label;

         assertEq(completion.throw, "mud");

     };

 }

 dbg.onEnterFrame = function handleEnter(f) {

     log += "(" + f.callee.name;

     f.onPop = makePopHandler(")" + f.callee.name);  

 };

 dbg.onExceptionUnwind = function handleExceptionUnwind(f, x) {

     assertEq(x, 'mud');

     log += "u" + f.callee.name;

 };

 log = '';

 try {

     g.i();

 } catch (x) {

     log += 'c';

     assertEq(x, "mud");

 }

 assertEq(log, "(i(h(g(fuf)fug)guh)hui)ic");