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Disabling browser "Save As" dialog in Selenium WebDriver tests

How to disable Save As dialog in Selenium WebDriver tests?

Solution for Firefox (add more MIME media types if necessary): 

FirefoxProfile firefoxProfile = new FirefoxProfile();
firefoxProfile.setPreference("browser.download.folderList",2);
firefoxProfile.setPreference("browser.download.manager.showWhenStarting",false);
firefoxProfile.setPreference("browser.download.dir", "/save/file/to/this/directory");
firefoxProfile.setPreference("browser.helperApps.neverAsk.saveToDisk","text/html, application/xhtml+xml, application/xml, application/csv, text/plain, application/vnd.ms-excel, text/csv, text/comma-separated-values, application/octet-stream");                            
WebDriver driver = new FirefoxDriver(firefoxProfile);

Solution for Google Chrome (this applies to all MIME media types): 

Map prefs = new Hashtable<>();
prefs.put("download.prompt_for_download", "false");
prefs.put("download.default_directory", "/save/file/to/this/directory");                    
DesiredCapabilities capabilities = DesiredCapabilities.chrome();
capabilities.setCapability("chrome.prefs", prefs);
WebDriver driver = new ChromeDriver(capabilities);

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