The Tor Browser / file revision

 // Debugger.Object.prototype.evalInGlobal: closures capturing the global

 var g = newGlobal();

 var h = newGlobal();

 var dbg = new Debugger;

 var gw = dbg.addDebuggee(g);

 var hw = dbg.addDebuggee(h);

 g.x = "W H O K I L L";

 h.x = "No Color";

 var c1 = gw.evalInGlobal('(function () { return x; })').return;

 var c2 = hw.evalInGlobal('(function () { return x; })').return;

 var c3 = gw.evalInGlobalWithBindings('(function () { return x + y; })', { y:" In Rainbows" }).return;

 var c4 = hw.evalInGlobalWithBindings('(function () { return x + y; })', { y:" In Rainbows" }).return;

 assertEq(c1.call(null).return, "W H O K I L L");

 assertEq(c2.call(null).return, "No Color");

 assertEq(c3.call(null).return, "W H O K I L L In Rainbows");

 assertEq(c4.call(null).return, "No Color In Rainbows");