Selenium - Focus and Blur fails randomly on Firefox

Question

I am testing on Firefox 55.0 Selenium 3.5.3 and I am having some trouble with Focusing on input element and after editing the text focusing out so the Client side validation can work and show error if needed.

javascriptExecutor.executeScript("document.getElementById('" + elementId + "').focus();");
javascriptExecutor.executeScript("document.getElementById('" + elementId + "').blur();");

this is the actual code.

Problem: The code works fine without any error but fails to show the error on random basis. I have webDriverWait for 5 seconds until the error shows up.

Any reason my code is failing on Firefox randomly???

Answer 1

Are you running multiple test with firefox simultaneously? If so, you could try to enable the flag focusmanager.testmode on the firefox profile. Check my answer here for more details.

Answer 2

Are you using Geckodriver to talk to the firefox instance?

I believe it has to do with the fact that Geckodriver does not start firefox with -foreground option.

Can you try adding firefoxOptions.addArguments("-foreground");