How to use a already opened firefox for testing in Selenium

Question

This declaration

WebDriver driver = new FirefoxDriver();

always opens a new instance window of Firefox. It doesn\'t use the already opened

Answer 1

Java example. First, you need to have Selenium server running.

java -jar C:\selenium-server-standalone-2.53.0.jar

To start a new session (first script):

WebDriver driver = new RemoteWebDriver(
                        new URL("http://localhost:4444/wd/hub"), 
                        DesiredCapabilities.firefox());

Then, to reuse (attach) that session (second script):

WebDriver driver = new RemoteWebDriver(
                        new URL("http://localhost:7055/hub"), 
                        DesiredCapabilities.firefox());

Notice the different port number.