proxy url username password settings Selenium Java

The below code is working fine mix this code to your code

import org.openqa.selenium.Proxy.ProxyType;` 

public static WebDriver dr = null;

org.openqa.selenium.Proxy proxy = new org.openqa.selenium.Proxy(); 

proxy.setSslProxy("proxyurl"+":"+8080); 

proxy.setFtpProxy("proxy url"+":"+8080); 

proxy.setSocksUsername("SSSLL277"); 

proxy.setSocksPassword("password"); 

DesiredCapabilities dc = DesiredCapabilities.firefox();

dc.setCapability(CapabilityType.PROXY, proxy); 

dr = new FirefoxDriver(dc);