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Firefox Browser Alert is not getting popped up

During automation testing, the expected alert is not getting popped up in Firefox browser.

By default the preference variable dom.disable_beforeunload has the value true which blocks the popup.

We need to set the value of preference variable dom.disable_beforeunload to false before launching the Firefox browser.
String browser = DriverFactory.getExecutedBrowser().getName()
if (browser.equalsIgnoreCase('FIREFOX_DRIVER')) {
FirefoxOptions firefoxOptions = new FirefoxOptions();
firefoxOptions.addPreference("dom.disable_beforeunload", false); // only for firefox browser special preference is needed.
WebDriver driver = new FirefoxDriver(firefoxOptions);
}else {
Here the desired capabilities option in Katalon doesn't work because the constructor of the Firefox driver accepts only Firefox options as input.