how to change value of page load dialog box in js?

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Hello Team

this is my code but not support in firefox
var myEvent = window.attachEvent || window.addEventListener;
var chkevent = (window.attachEvent) ?onbeforeunload : beforeunload;
myEvent(chkevent, function(e) { // For >=IE7, Chrome, Firefox
window.onbeforeunload = null;
var confirmationMessage = 'Rajeev Rahi'; // a space
(e || window.event).returnValue = confirmationMessage ;
return confirmationMessage ;
});
Rajeev Rahi is showing when i refresh on chrom but not work in firefox
Actually i want change in refresh pop-up.

Posted 26-Nov-15 1:22am

Rajiv Rahi

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Richard Deeming · Accepted Answer · 2015-11-26T04:40:00

You can't. I ran into this problem yesterday, and it turns out it's a "security feature":
Bug 588292 - Remove site-supplied text for beforeunload and onunload dialogs, and improve button text [^]

Quite why Mozilla think it's a security problem, when every other browser supports it, I don't know.

The only workaround is to display a message in the "click" event of every element which would cause the page to unload. It's messy and fragile, but it's the only way to display a custom message.