The Tor Browser / file revision

 // getColumnOffsets correctly places array properties.

 var global = newGlobal();

 Debugger(global).onDebuggerStatement = function (frame) {

     var script = frame.eval("f").return.script;

     script.getAllColumnOffsets().forEach(function (offset) {

         script.setBreakpoint(offset.offset, {

             hit: function (frame) {

                 assertEq(offset.lineNumber, 1);

                 global.log += offset.columnNumber + " ";

             }

         });

     });

 };

 global.log = '';

 global.eval("function f(n){var a=[1,2,3]} debugger;");

 global.f(3);

 // Should hit each item in the array.

 assertEq(global.log, "18 21 23 25 19 ");