The Earny extension blocks login. The appears to be due to the overly that Earny puts over pages, blocking the ability to click into the Username and/or Password box. I've found that you can TAB into the boxes and type in Username and Password but using a password manager (I use LastPass) may complicate this.
Unfortunately, there doesn't seem to be a TAB stop for the login.
Disabling the extension or deleting the Earny DIV in DevTools (F12) seems to resolve the issue.