Web: Saving logins
Currently Epiphany uses an infobar to prompt users to save their passwords which is a bit of a misuse of the pattern, and with 3 buttons in there it absolutely does not work on narrow widths.
Other browsers tend to have a piece of UI that is sourced from or attached to the URL bar (see below)
Relevant Art
Chrome
Firefox
Safari (iOS)
Edited by Sam Hewitt