Having just upgrading to the paid version of Keeper today, tried this add-on. I cannot get it to work.
I have removed and re-installed many times, closed Firefox, reopened Firefox, but to no avail.

I even installed the previous version, but also keep getting the "Warning Unresponsive script".

As soon as I log in, the email box and password become blank.

At no time can I click on the help button and get any response.