Can't start server message in case try to run Firefox on cypress 4.0.1

[aman-mcmb]

Current behavior:

Firefox still does not open on Mac. No Firefox window was open. Even i restarted the system and try to run firefox through cypress

Error message

It shows Can't start server.

An unexpected error was received from Marionette connection:

Error: cannot open socket

To avoid this error, ensure sure that there are no other instances of Firefox launched by Cypress running.

Desired behavior:

Firefox Browser should open with cypress.

Test code to reproduce

install cypress 4.0.1
Try to Run the Scripts over FireFox.

Versions

Cypress : 4.0.1

OS - iMac 10.14.6 , macOS Mojave
3.4 GHz Intel Core i5

[YOU54F]

Have you got Firefox already open, prior to starting cypress? If so it won’t work, as per the message. ( messages states ff launched by cypress but it could be ff launched by user prior to running cypress )

If you expect Firefox w/ cypress to work, with Firefox open beforehand then this ticket is a dupe of #6380

[aman-mcmb]

Have you got Firefox already open, prior to starting cypress? If so it won’t work, as per the message. ( messages states ff launched by cypress but it could be ff launched by user prior to running cypress )

If you expect Firefox w/ cypress to work, with Firefox open beforehand then this ticket is a dupe of #6380

No firefox window was open. i check that already twice. Even i have restarted the system and then start cypress. Still not working.

[YOU54F]

Hmm. Does it also fail to load in 4.0.0?

[aman-mcmb]

Hmm. Does it also fail to load in 4.0.0?

no, 4.0.1

[jennifer-shehane]

Duplicate of #6387