Chrome: Ad blockers are a popular, if controversial group of software, but they don't cover everything. Do Not Disturb ups the ante by blocking content widgets, data miners, and a bunch of other things that might annoy you.
The app provides a report of the many things it blocks on your behalf, many of which may not actually be visible to the user. You can also white list certain sites so it won't accidentally disable something you do want to keep around.
Do Not Disturb | Chrome Web Store via Ghacks