How to open a new tab using Selenium WebDriver?

Question

How to open a new tab in the existing Firefox browser using Selenium WebDriver (a.k.a. Selenium 2)?

Answer 1

Same example for nodejs:

var webdriver = require('selenium-webdriver');
...
driver = new webdriver.Builder().
                    withCapabilities(capabilities).
                    build();
...

driver.findElement(webdriver.By.tagName("body")).sendKeys(webdriver.Key.COMMAND + "t");