[🐛 Bug]: Selenium 4.36.0 onwards doesnot work with firefox 128 and above and geckodriver 0.36.0

[GEAGARWAL]

Description

We were trying to execute the GUI test cases on selenium 4.36.0 and above, which were working fine with selenium version 4.35.0 on firefox 128 using geckodriver 0.36.0 . With same releases of firefox and geckodriver the code return error status 64 with newer versions of selenium. The python code below generates the same error we are observing with selenium release 4.36.0 onwards

Reproducible Code

from selenium.webdriver import Firefox
from selenium.webdriver.firefox.service import Service
from selenium.webdriver.firefox.options import Options

options = Options()
options.headless = True  # optional

service = Service(executable_path='/usr/local/bin/geckodriver')
driver = Firefox(options=options, service=service)  # Fails with status 64 on selenium>=4.36.0
driver.get('http://10.19.49.174')
driver.quit()

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ℹ️ Last known working version: 4.35.0

[selenium-ci]

@GEAGARWAL, thank you for creating this issue. We will troubleshoot it as soon as we can.

Selenium Triage Team: remember to follow the Triage Guide

[selenium-ci]

We need more information about this issue in order to troubleshoot.

Please turn on logging and re-run your code. Information on how to adjust logs for your language can be found in our
Troubleshooting documentation.

[cgoldberg]

options.headless = True

This isn't the correct way to enable headless. You need to do:

options.add_argument("--headless")

We should probably fix the code to raise an AttributeError if you try that.

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Unless there is a specific reason you need to use your system installed version of Firefox and a version of geckodriver you downloaded separately, it's better to let Selenium Manager handled installing them both.

For example, to run Firefox 128 in headless mode with the correct version of geckodriver:

from selenium.webdriver import Firefox
from selenium.webdriver.firefox.options import Options

options = Options()
options.browser_version = "128"
options.add_argument("--headless")

driver = Firefox(options=options)

Also, the latest version of Selenium should work fine with the latest version of Firefox.