Firefox does not support the innerText property. <html> <head> <title>InnerText Example</title> <script type="text/javascript"> function useInnerText() { var oDiv = document.getElementById("div1"); oDiv.innerText = oDiv.innerText; } </script> </head> <body> <div id="div1"><b>Hello</b> world</div> <input type="button" value="Use InnerText" onclick="useInnerText()" /> </body> </html>