code: public static String getBrowser() {
          String browser = getProgramProperty(BROWSER);
          if (browser == null || "".equals(browser)) {
              browser = Browser.BrowserName.HTMLUNIT.toString();
          }
          return browser;
      }
docs: Retrieves the browser property if it is set. This can be a single browser name, or browser details. If it is
  not set, HTMLUnit will be returned as the default browser to use
  
  @return String: the set browser