Changing your email address is broken in Firefox under Ubuntu 18.04

I'm seeing this in Firefox 60.0.2 on Linux but am unable to reproduce it in Chrome or Epiphany. I have to enter my password in order to save the changed email address, but when I click on the empty password box it immediately moves the focus back to the email box:


Slightly different if I try to click in the password box without having edited the email:


Start by reproducing the email-change flow in Firefox on Ubuntu, using the two interaction cases described in the issue. Trace the email and password form behavior to identify why focus leaves the password field; done means the password can be entered and the changed email can be saved in Firefox without regressing the other browser cases.

Written by the indexing model from the issue text.