[SOLVED] In Firefox, Write to a File using Javascript?

In Firefox, Write to a File using Javascript?

Situation:
I have created a installation setup(local) that returns a URL e.g. ved.test.com which is mapped to an IP 11.22.33.44.
Thus to make the web application accessible after installation, user has to make an entry in the hosts file under C:\WINNT\system32\drivers\etc directory explicitly.

Approach:
After the installation application gets completed, application writes the file using JavaScript.

Problem:
Writing a File using JavaScript is supported in IE. I need a Solution for Firefox. Code used:-

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Write To A File</title>
<script language="javascript">
    function WriteToFile()
    {
    /* The below statement is supported in IE only */
    var fso = new ActiveXObject("Scripting.FileSystemObject");
    var s = fso.CreateTextFile("C:\\Test.txt", true);
    s.WriteLine('IE Supports Me!');
    s.Close();
    }
</script>
</head>
    <body onLoad="WriteToFile()">
</body>
</html>

Have also referred the link in SO:
How to read and write into file using JavaScript?

Kindly provide a solution that supports writing a file using JavaScript that runs in Firefox browser.

Solution

You can't do this, for hopefully obvious security reasons. JavaScript has no access to the file system...in IE it's not JavaScript, but ActiveX doing this...it just has a JavaScript API exposed.

The problem isn't that Firefox doesn't do this...it's that IE ever allowed it :)