Anti-kibitzer mode, which hides the names and karma values of posts and comments.
On GreaterWrong, take a look to the right side of the page, and you’ll see this icon:
Click it, and it’ll change to this:
Now the authors of posts and comments, and all karma values, are hidden:
Click the icon again to disable. (You’ll be asked if you’re sure you want to disable anti-kibitzer mode. NOTE: You can skip the confirmation prompt by holding the Shift key while clicking to disable.)
Having the anti-kibitzer turned on doesn’t interfere with any other functionality. You can still post, comment, reply, vote, click on users’ names to go to their user page (where their name will be obfuscated), etc. You can turn it on or off at any time.
Your own name, and your own karma values, are not hidden.
See the original Less Wrong post about this feature for more discussion.