The Tor Browser / file revision

 // Script.prototype.getBreakpoints returns breakpoints for the current Debugger object only.

 var g = newGlobal();

 var debuggers = [];

 var hits = 0;

 function attach(g, i) {

     var dbg = Debugger(g);

     dbg.onDebuggerStatement = function (frame) {

         var s = frame.script;

         var offs = s.getLineOffsets(g.line0 + 2);

         var hitAny = false;

         var handler = {

             hit: function (frame) {

                 assertEq(this, handler);

                 assertEq(frame.script, s);

                 var bps = s.getBreakpoints();

                 assertEq(bps.length, offs.length);

                 for (var i = 0; i < bps.length; i++)

                     assertEq(bps[i], handler);

                 if (!hitAny) {

                     hitAny = true;

                     hits++;

                 }

             }

         };

         for (var i = 0; i < offs.length; i++)

             s.setBreakpoint(offs[i], handler);

         hits++;

     };

     debuggers[i] = dbg;

 }

 for (var i = 0; i < 3; i++)

     attach(g, i);

 g.done = false;

 g.eval("var line0 = Error().lineNumber;\n" +

        "debugger;\n" +      // line0 + 1

        "done = true;\n");   // line0 + 2

 assertEq(hits, 6);

 assertEq(g.done, true);