Post Count on Index
Displays a logged in member their post count on the index page. Clicking the text will search their posts, matching the behavior of memberlist_body.html, memberlist_view.html, viewtopic_body.html etc.
Copy the extension to phpBB/ext/restlessrancor/postcountonindex
Go to "ACP" > "Customise" > "Extensions" and enable the "Post Count on Index" extension.