F.B. (Fluff Busting) Purity is a Facebook customizing browser extension. It alters your view of Facebook to show only relevant information to you. It lets you remove the annoying and irrelevant stories from your newsfeed such as game and application spam, ads and sponsored stories. It can also hide the boxes you don't want to see on each side of the newsfeed.
Note: If you try to put a link to the FB Purity on Facebook it will flag it as "spammy". One look at the site reveals it to be the old style high quality website. It has no ads and accepts donations for support.