Social Fixer for Facebook is a free browser add on for Safari or Chrome. It gives you a wide range of options to better manage what you do and don’t see on Facebook.
Couple of my favorite features is the filter that helps block political posts based on keywords.
Another is an option that allows me to check a box on each post (if we choose) to confirm that we have seen it, hide it and never see it again. It clears the clutter of some of the one times posts that only need to be seen once.