# Unknown error on login in Firefox

**URL:** <https://meta.discourse.org/t/unknown-error-on-login-in-firefox/183550>\
**Category:** Product Support\
**Created:** [March 17, 2021, 3:51pm UTC](https://meta.discourse.org/t/unknown-error-on-login-in-firefox/183550 "2021-03-17T15:51:04Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**Author:** ![Iv1](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/iv1/32/213550_2.png) [@Iv1](https://meta.discourse.org/u/Iv1)\
**Post date:** [March 19, 2021, 1:45am UTC](https://meta.discourse.org/t/unknown-error-on-login-in-firefox/183550/10 "2021-03-19T01:45:14Z")

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Dear friends,

the error happens when the websites.firstPartyIsolate setting is changed from default, just for future reference.

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_[View the full topic](https://meta.discourse.org/t/unknown-error-on-login-in-firefox/183550)._