Looks good, one thing though: as a user if I scroll down and see the footer, after some more scrolling it disappears, however when I scroll back up it does not reappear - which is my expectation.

That is a good idea. My thought was to make it disappear when you scroll up to provide a mechanism to suppress it. I would guess 99% of the time the user will not want it. But you do have a good idea.

Why even have footers in the age of endless scrolling?

People still look for periphery information at the bottom of the page. Until that habit changes I think we'll still need to keep it there.

Great job. This is definitely needed.