Firefox can’t find the file at moz-extension

I changed the URL for one of my Keepass entries … and now get this error when launching via Kee extension:

I then deleted the Keepass entry and created a new one - but error persists. Other entries continue to work as always. I can login manually or via Keepass with no problem.

Using Kee 4.0.7.

How do I fix this problem? And what did I do wrong? TIA

What is the URL in your entry?

Did you create the new entry by saving it from the Kee popup? If not, try that.

Thanks, that worked!

I had ‘wellsfargo.com’ in the entry - should be ‘https://www.wellsfargo.com/’.

Strange error message for such a mistake … doesn’t give a clue to cause of error.