The page footer is not always inside a `<footer>` element (Accessibility)
If you go to the main page of torproject.org the footer content ("Download Tor Browser", "Our mission", etc) is not within a <footer>
element.
However, on other pages, like torproject.org/about it is inside a <footer>
element.
Using a <footer>
element helps screen reader users navigate the page, and should be consistent between pages.