Browser extension update resets Settings to defaults

Found a Safari conflict between 1Password extension and the MalwareBytes extension. (Just Safari, not Chrome or Firefox)

My client reported 1Password extension wasn't filling in his Google login. Trying to replicate, I saw it logged in via Gmail, but not if trying to login to Google via the YouTube page. 

Finally fixed by going to Safari > Settings > Websites and set MalwareBytes extension permissions for YouTube from Allow to Deny.