How to use setAndroidPackage method of org.openqa.selenium.firefox.FirefoxOptions class

Because they're in the iframe, you need switch to the iframe first.

Two lines added to your existing code as follows:

WebDriver driver = new FirefoxDriver();     
driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
driver.get("http://www.thomson.co.uk/holidays.html");

// optional, unnecessary in your case
// driver.switchTo().defaultContent(); // make sure outside of all iframes

// switch to search frame
WebElement searchFrame = driver.findElement(By.cssSelector("iframe[src='/thomson/page/byo/search/usp.page']"));
driver.switchTo().frame(searchFrame);

driver.findElement(By.id("searchbutton")).click();
driver.findElement(By.id("holidayAttribute_1")).click();
driver.findElement(By.id("holidayAttribute_2")).click();
driver.findElement(By.id("holidayAttribute_3")).click();

Recently Selenium has launched Selenium 3 and if you are trying to use Firefox latest version then you have to use GeckoDriver:

System.setProperty("webdriver.gecko.driver","G:\\Selenium\\Firefox driver\\geckodriver.exe");
WebDriver driver = new FirefoxDriver();

You can check full documentation from here

Maven looks for tests named *Test, Test*, or *TestCase by default. You can configure it to run classes with other names, but it's much better to follow the conventions if you don't have a compelling reason not to. Rename your class to something that starts or ends in Test and give it another try.

See this answer: Maven does not find JUnit tests to run as well.

The syntax you have used that is not for cssSelector that for XPATH and you have missed parenthesis as well.

Try following xpath now.

WebElement big = browser.findElement(By.xpath("//div[contains(@class,'Big')]"));
WebElement medium = big.findElement(By.xpath(".//div[contains(@class,'Medium')]"));
WebElement small = medium.findElement(By.xpath(".//div[contains(@class,'Small')]"));

However you can do it in once like.

WebElement small = browser.findElement(By.xpath("//div[contains(@class,'Big')]//div[contains(@class,'Medium')]//div[contains(@class,'Small')]"));

In Webdriver, you should use driver.switchTo().defaultContent(); to get out of a frame. You need to get out of all the frames first, then switch into outer frame again.

// between step 4 and step 5
// remove selenium.selectFrame("relative=up");
driver.switchTo().defaultContent(); // you are now outside both frames
driver.switchTo().frame("cq-cf-frame");
// now continue step 6
driver.findElement(By.xpath("//button[text()='OK']")).click(); 

The type command may not be enough to trigger the autocomplete. Dave Webb's suggestions are otherwise spot on. My only addition would be that you might need the typeKeys command, which causes slightly different JavaScript events to be fired, which may be more likely to trigger the autocomplete widget.

I would simply disable the print dialog by overriding the print method :

((JavascriptExecutor)driver).executeScript("window.print=function(){};");

But if you goal is to test that the printing is called then :

// get the print button
WebElement print_button = driver.findElement(By.cssSelector("..."));

// click on the print button and wait for print to be called
driver.manage().timeouts().setScriptTimeout(20, TimeUnit.SECONDS);
((JavascriptExecutor)driver).executeAsyncScript(
    "var callback = arguments[1];" +
    "window.print = function(){callback();};" +
    "arguments[0].click();"
    , print_button);

Unfortunately Selenium WebDriver 2.53.0 is not compatible with Firefox 47.0. The WebDriver component which handles Firefox browsers (FirefoxDriver) will be discontinued. As of version 3.0, Selenium WebDriver will need the geckodriver binary to manage Firefox browsers. More info here and here.

Therefore, in order to use Firefox 47.0 as browser with Selenium WebDriver 2.53.0, you need to download the Firefox driver (which is a binary file called geckodriver as of version 0.8.0, and formerly wires) and export its absolute path to the variable webdriver.gecko.driver as a system property in your Java code:

System.setProperty("webdriver.gecko.driver", "/path/to/geckodriver");

Luckily, the library WebDriverManager can do this work for you, i.e. download the proper Marionette binary for your machine (Linux, Mac, or Windows) and export the value of the proper system property. To use this library, you need to include this dependency into your project:

<dependency>
    <groupId>io.github.bonigarcia</groupId>
    <artifactId>webdrivermanager</artifactId>
    <version>5.1.0</version>
</dependency>

... and then execute this line in your program before using WebDriver:

WebDriverManager.firefoxdriver().setup();

A complete running example of a JUnit 4 test case using WebDriver could be as follows:

public class FirefoxTest {

    protected WebDriver driver;

    @BeforeClass
    public static void setupClass() {
        WebDriverManager.firefoxdriver().setup();
    }

    @Before
    public void setupTest() {
        driver = new FirefoxDriver();
    }

    @After
    public void teardown() {
        if (driver != null) {
            driver.quit();
        }
    }

    @Test
    public void test() {
        // Your test code here
    }
}

Take into account that Marionette will be the only option for future (for WebDriver 3+ and Firefox 48+), but currently (version 0.9.0 at writing time) is not very stable. Take a look to the Marionette roadmap for further details.

UPDATE

Selenium WebDriver 2.53.1 has been released on 30th June 2016. FirefoxDriver is working again with Firefox 47.0.1 as browser.

Add this to the options you pass to the driver:

options.addArguments("disable-infobars");