Hello, thank you very much for this software.
Unfortunately I am unable to connect:

Connection state: Error
Cannot connect to KeeWeb, please check if KeeWeb is open and browser integration is enabled in settings.

• osx 10.12
• KeeWeb v1.18.3 (337ef44, 2021-05-09)
• firefox 88.0.1 (64-bit)
• firefox KeeWeb Connect enabled in settings/browser