Newsfeed Eradicator for Safari.
Newsfeed eradicator blocks the distracting Facebook newsfeed. Newsfeed eradicator for Chrome was originally created by Jordwest.
I appreciated the Chrome extension a lot, but I use safari for it's power management.
I don't have a safari developer account anymore so I will not update the extension.
Please check out https://github.com/maxfriedrich/quiet-facebook for a simpler solution.