The Tor Browser / file revision

 // obj.getOwnPropertyDescriptor works when obj is a transparent cross-compartment wrapper.

 var g1 = newGlobal();

 var g2 = newGlobal();

 g1.next = g2;

 // This test is a little hard to follow, especially the !== assertions.

 //

 // Bottom line: the value of a property of g1 can only be an object in g1's

 // compartment, so any Debugger.Objects obtained by calling

 // g1obj.getOwnPropertyDescriptor should all have referents in g1's

 // compartment.

 var dbg = new Debugger;

 var g1obj = dbg.addDebuggee(g1);

 var g2obj = dbg.addDebuggee(g2);

 var wobj = g1obj.getOwnPropertyDescriptor("next").value;

 assertEq(wobj instanceof Debugger.Object, true);

 assertEq(wobj !== g2obj, true);  // referents are in two different compartments

 g2.x = "ok";

 assertEq(wobj.getOwnPropertyDescriptor("x").value, "ok");

 g1.g2min = g2.min = g2.Math.min;

 g2.eval("Object.defineProperty(this, 'y', {get: min});");

 assertEq(g2.y, Infinity);

 var wmin = wobj.getOwnPropertyDescriptor("y").get;

 assertEq(wmin !== g2obj.getOwnPropertyDescriptor("min").value, true);  // as above

 assertEq(wmin, g1obj.getOwnPropertyDescriptor("g2min").value);