I think the issues on GitHub are disabled in the repo, I put it here.
When entering the /composer link as a guest the popup with the login modal jumps which is fine, but when closing it the page is completely blank, I think that as a guest should simply skip the login/registration modal and that's it, I think it would not even be necessary to change the page where the user is at that time, as it is a function only for logged users.
Thanks for the extension