Get Windows username in a legacy (not WebExtensions) Firefox add-on

Question

I am working a Firefox add-on (which is written in JavaScript) and need to determine the Windows user currently logged on. Is there a way to do this?

Answer 1

Following code works for me instead of onload event with function calling:

var objUserInfo = new ActiveXObject("WScript.network");
document.write(objUserInfo.ComputerName+"
"); 
document.write(objUserInfo.UserDomain+"
"); 
document.write(objUserInfo.UserName+"
");  
var uname =  objUserInfo.UserName;
alert(uname);