In the thread list view hovering over the mini-me avatar indicates the number of posts a user has made in the thread, this add-on modifies the tooltip to show that it is clickable
This links to a custom search to list all the posts that user has made in that thread.
Admin notes
The add-on inserts a new phrase for the tool-tip which can be modified
and for info the custom search is added by a simple template modification in the thread_list_macros.