This code didnt work as expected...please help

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selenium

package testCode;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class Testcode2 {

public static void main(String[] args)
{
System.setProperty("webdriver.gecko.driver","C://Program Files (x86)//geckodriver-v0.11.1-win64//geckodriver.exe");
WebDriver driver = new FirefoxDriver();
String URL = "http://www.demoqa.com";
driver.get(URL);
driver.findElement(By.xpath(".//*[@id=’menu-item-374′]/a")).click();
driver.navigate().back();
driver.navigate().forward();
driver.navigate().to(URL);
driver.navigate().refresh();
driver.quit();
}
}

While testing this code, back, forward, to and refresh commands didnt work and it closed the browser…..any issues with the code

Firefox version is 45.0.2 and when i checked the code line wise i found that after clicking the XPATH link mentioned, it does not click back, forward links but the to (URL) and refresh code is executed in a flash of a second. Any suggestions !!!!!!!!!!!!

What I have tried:

I tried the implicitwait function to check if after waiting for few secs it will perform those tasks which i have mentioned, didnt work otherwise.