I tried like this
ChromeOptions options = new ChromeOptions();
options.addExtensions(new File("/path/to/extension.crx"));
DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability(ChromeOptions.CAPABILITY, options);
ChromeDriver driver = new ChromeDriver(capabilities);
but in new versions of Chrome CRX is not accepted and you need to set CRX3
Caused by: org.openqa.selenium.SessionNotCreatedException: session not created: cannot process extension #1
from unknown error: CRX verification failed to parse extension header. Chrome supports only CRX3 format. Does the extension need to be updated?
Does anyone know how to solve this problem?