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

driver.findElement(By.cssSelector("body")).sendKeys(Keys.CONTROL +"t");

ArrayList tabs = new ArrayList (driver.getWindowHandles());

driver.switchTo().window(tabs.get(0));