Toggles comments on many popular websites.
If you've ever gone to a website and read its comments section, you'll have seen that it's just a vitriolic, idiotic wasteland.
Why subject yourself to that?
Shut Up hides comments by default. And, you can show comments on a page with a click of a button. It will remember where you turn on comments, and will show them the next time you visit that site.
That's it. Simple and free. Enjoy!
Uses shutup.css by Steven Frank, with permission.