Got paranoid, removed "Mark All Favorites Read" button · 3:24pm Apr 8th, 2012
Published the style on userstyles.org. For use with Stylish on Firefox or Stylish on Chrome.
Didn't actually test it with Firefox, but I use attribute matching selectors in my personal chatzilla style, so it ought to work
Edit: It's paranoia because there's already an are-you-sure confirmation attached to the function. Just seeing the thing worries me