Add a 'detach' flag to leave Firefox running after Geckodriver exits #2247

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1. whimboo commented on Jun 9, 2026

   

   whimboo

   on Jun 9, 2026

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   Which signal are you sending? I assume it's SIGINT at the moment? Why can't you just send SIGKILL to the process, which cannot be handled by geckodriver?
2. whimboo

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   geckodriver

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   on Jun 9, 2026
3. labkey-tchad commented on Jun 9, 2026

   

   labkey-tchad

   on Jun 9, 2026

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   I'm launching Geckodriver via Selenium WebDriver for Java. As far as I can tell, it doesn't provide that level of control over the driver lifecycle.
4. whimboo commented on Jun 9, 2026

   

   whimboo

   on Jun 9, 2026

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   So how did your Selenium testrunner handle it for geckodriver < 0.37.0? Somehow geckodriver must have been killed to keep Firefox running. A normal exit of geckodriver always quits the session first.
5. labkey-tchad commented on Jun 9, 2026

   

   labkey-tchad

   on Jun 9, 2026

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   Something like this:

   FirefoxDriverService driverService = new GeckoDriverService.Builder().build();
   FirefoxDriver driver = new FirefoxDriver(driverService);
   /* do some testing */
   driverService.stop();
   /* Firefox window is left open with geckodriver < 0.37.0 */
6. whimboo commented on Jun 10, 2026

   

   whimboo

   on Jun 10, 2026

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   Ok, I did some more investigation of the Selenium code and it first tries to use SIGTERM to shutdown the driver. For further discussions I filed https://bugzilla.mozilla.org/show_bug.cgi?id=2046321.
7. whimboo

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   on Jun 10, 2026
8. labkey-tchad

   added a commit that references this issue on Jun 25, 2026

   Leave browser windows open after test failures (#3074)

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