I have updated to 2.1.2 on Firefox 89.02 This is what I get when I try to clip:

I have restarted FireFox. I have restarted Joplin and it is running. I'm on Windows.
Joplin 2.0.11 (prod, win32)
Profile Version: 39
Revision: 981b1d845
Before upgrading to 2.1.2 it worked fine.