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Test case: echo.js file: self.addEventListener('message', function(e) { var data = e.data; self.postMessage('Echo: '+data); }, false); index.html file: <!DOCTYPE html> <html> <head> <title>Web Worker Test</title> </head> <body> <div>Message: <input id="field" type="text"><button onclick="send()">Send</button></div> <span id="output"></span> <script> worker = new Worker('echo.js'); worker.addEventListener('message', function(e) { document.getElementById('output').innerHTML = e.data; }); send = function() { var text = document.getElementById('field').value; worker.postMessage(text); }; </script> </body> </html> Steps to reproduce: 1. Place a breakpoint into the callback in echo.js file. 2. Run index.html in Chrome with NetBeans Connector. 3. Type some text into the field in the page and press Send button => web worker's code is performed but the debugger does not stop there Note that this scenario works when Chrome Developer Tools are used.