"You saved me tons of work"
— Tanner Moushey What They Say

How can I add a favicon to my site?

WordPress 4.3 introduced a Site Icon feature that you can use in Appearance > Customize > Site Identity.

If you are using Exodus 1.4.3 or Resurrect 1.8.2 or older, you will need to update your theme to the latest version in order to see this option in the Customizer.