The Tor Browser / file revision

 // dumb basics of uncaughtExceptionHook

 load(libdir + 'asserts.js');

 var desc = Object.getOwnPropertyDescriptor(Debugger.prototype, "uncaughtExceptionHook");

 assertEq(typeof desc.get, 'function');

 assertEq(typeof desc.set, 'function');

 assertThrowsInstanceOf(function () { Debugger.prototype.uncaughtExceptionHook = null; }, TypeError);

 var g = newGlobal();

 var dbg = new Debugger(g);

 assertEq(desc.get.call(dbg), null);

 assertThrowsInstanceOf(function () { dbg.uncaughtExceptionHook = []; }, TypeError);

 assertThrowsInstanceOf(function () { dbg.uncaughtExceptionHook = 3; }, TypeError);

 dbg.uncaughtExceptionHook = Math.sin;

 assertEq(dbg.uncaughtExceptionHook, Math.sin);

 dbg.uncaughtExceptionHook = null;

 assertEq(dbg.uncaughtExceptionHook, null);