"Error: You are not logged in to jpdb.io - Reviewing cards requires being logged in", despite being logged in on Firefox.

[mikzorz]

I've tested both Wikipedia and ttsu, I've tried different words and different review grades. I've relogged into jpdb. The cards do get added to my deck, I just can't review them.

As I was writing this, I decided to test it with (ungoogled) chromium. Works fine. Issue is only on Firefox, for me.

It's very possible that one of the many tweaks I've made to my Firefox settings is causing problems.