K-Meleon 76 RC2. I get this error message after filling some forms: "This field cannot be empty". Those websites don't recognize the content of a login or a comment box submited by K-Meleon 76 RC2. This wasn't an issue on K-Meleon 75.1.
Example: I can't login or post any comment on this webpage:
https://observador.pt/
It requires a login through a Gmail popup window that cannot be filled.