Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version 15.0.5:
Operating system and version Ubuntu 16.04.6 LTS:
Apache or nginx version Apache 2.4.18:
PHP version 7.2.16:
Firefox version 66.0.2 (64-Bit):
The issue you are facing:
When starting my firefox and trying to login to my nextcloud web session the login screen gets cleared w/o and message and comes back with empty user/pw fields.
The only chance I currently have is doing a password reset using the same password and then I can login successfully. But this is only working within the same firefox tab I have done the password reset. Doing a logout and trying to login in a new tab has the same result w/o success.
This is obviously only a problem in firefox
Is this the first time you’ve seen this error? N:
Steps to replicate it:
- see above