For different browsers/drivers there are different profiles/options that need to be set:
Firefox
FirefoxProfile ffprofile = new FirefoxProfile();
ffprofile.setPreference("dom.webnotifications.enabled", false);
WebDriver driver = new FirefoxDriver(ffprofile);
Chrome (Source: https://stackoverflow.com/a/34368704/904375)
Map prefs = new HashMap();
prefs.put("profile.default_content_setting_values.notifications", 2);
ChromeOptions options = new ChromeOptions();
options.setExperimentalOption("prefs", prefs);
WebDriver driver = new ChromeDriver(options);
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