The Tor Browser / file revision

 // Debugger.Object.prototype.global retrieves the correct global.

 var dbg = new Debugger;

 var g1 = newGlobal();

 var g1w = dbg.addDebuggee(g1);

 var g2 = newGlobal();

 var g2w = dbg.addDebuggee(g2);

 assertEq(g1w === g2w, false);

 assertEq(g1w.global, g1w);

 assertEq(g2w.global, g2w);

 var g1ow = g1w.makeDebuggeeValue(g1.Object());

 var g2ow = g2w.makeDebuggeeValue(g2.Object());

 assertEq(g1ow.global, g1w);

 assertEq(g2ow.global, g2w);

 // mild paranoia

 assertEq(g1ow.global === g1ow, false);

 assertEq(g2ow.global === g2ow, false);

 // The .global accessor doesn't unwrap.

 assertEq(g1w.makeDebuggeeValue(g2.Object()).global, g1w);

 assertEq(g2w.makeDebuggeeValue(g1.Object()).global, g2w);