Gecko Driver issues. - Yash-777/SeleniumDriverAutomation GitHub Wiki

UNEXPECTED_ALERT_BEHAVIOUR.IGNORE is not supported by GeckoDriver.

String firefoxVersion = "55", FF_DriverPack = "v0.19.0";
capabilities.setCapability(CapabilityType.UNEXPECTED_ALERT_BEHAVIOUR, 
                           UnexpectedAlertBehaviour.IGNORE);

Exception:

org.openqa.selenium.InvalidArgumentException:
    ignore was not a valid `unhandledPromptBehavior` value.

//unhandledPromptBehavior was not a the name of a known capability or a valid extension capability

Issue commented by Yash-777 - Bug 1264259

DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability(CapabilityType.UNEXPECTED_ALERT_BEHAVIOUR,
	                   UnexpectedAlertBehaviour.DISMISS);

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driver.close() issue 966.

org.openqa.selenium.SessionNotCreatedException: Tried to run command without establishing a connection
Build info: version: '3.5.1'

Solution:

boolean isGechoDriver = true;

if (!isGechoDriver) {
    driver.close();
}
driver.quit();

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driver.manage().window().maximize(); works incorrectly in Firefox gecko driver; issue 993

Solution:

if (!isGechoDriver) {
    driver.manage().window().maximize();
}

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While signing selenium-3 jar we have faced some problem. To overcome this, we need to remove duplicate files in jar and then we need to sign the jar file.