The thing is pretty useless and only for true Habr fans.
On each page under the profile displays the karma, rating and position in the rating.
Thanks akira, showed that habr too has API. Although very, very, very poor.
Here is the code for greasemonkey:
watch
Just replace cyxapeff with your nickname. Well, or on the nickname of someone you want to watch.
What it looks like:
')
PS 1) I can’t write to js this time.
2) I have not tested this script almost anywhere.
3) This garbage can be displayed on any site, not only Habré.