On https://security.stackexchange.com/users/login page for a site where I don't yet have an account, if I select the "Log in using Stack Exchange" box, when I hit enter from the password form, nothing happens.
This will be fixed in the next build. Hitting enter in the log in or signup forms will submit as expected.
I've added a client-side fix for this issue into the Stack Overflow Unofficial Patch v1.10.
Basically, the cause of the problem is that the "submit" button on the form is not really a normal
What this code does is trigger on Enter key presses in either of the e-mail / password input boxes, assuming that (just to be safe) no other event handler has stopped them or prevented their default behavior yet. It then checks if both of the fields are filled, and, if so, simulates a click on the submit button; otherwise, it transfers input focus to the first empty field.