It displays the user's accept rate in their userbox on questions (updated to work with Firefox lately), and also the site on which they have the most rep (besides the current one) and the amount of rep they have there.
Me, without an accept rate (due to few questions):
Some other guy, with an accept rate:
Known issue: It doesn't nicely format the rep on the other site with "k" or ",".
It is a fork of User Accept Rate and you should pick this one or that, but not both. This one makes two API calls per question; that one makes one.
- 0.1: Initial version
- 0.2: Fix jQuery dependency strangeness