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How to disable back button in Mozilla?

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Answer:

<html><head>
<title>noBack</title>
<script type="text/javascript">
function noBack(){window.history.forward();}
</script>
</head>
<body onload="noBack();" onpageshow="if(event.persisted)noBack();" onunload="">
...blabla...
</body></html>

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