With infinite scrolling, you’re never going to see the footer. This is a problem if you’ve got widgets in the footer, but fortunately the Jetpack team thought of this. They’re included an optional argument footer_widgets which can tell whether or not a theme has footer widgets. If it does, it’ll switch the type from scroll to click.
Cover doesn’t use footer widgets — all the widgets go inside the overlay — but it does have the option of a footer social media menu. In the event of this menu’s existence, the infinite scrolling support needs to be aware enough to switch the type.
This is where the Jetpack-provided filter infinite_scroll_has_footer_widgets comes in handy. Here is Cover’s implementation: