Hi,
I really like this extension, but nowadays there are more and more pages that don't play well with it, which is why need to add exceptions.
However, I cannot store exceptions in the field Exclude sites (semicolon separated) any more. Whenever I add something, hitting Save toggles between the old and new values, and after re-starting Firefox I'm back to only the old values again.
RandomUA 1.1.0 on Firefox 73.0.1 (64-bit) for Ubuntu.
Can anyone reproduce this?