There are three tabs: Historic, Detail and Lists.
The first one shows a graphic of every event triggered by the Web Firewall since the extension was installed. Data is grouped in 3 categories: Firewall rules applied, Blocked access attempts and User/session protection entries. The second one shows links with the number of events generated by the Web Firewall in certain periods (today, yesterday, last year...).
The Lists tab shows the number of elements on each List (Blacklist, Whitelist and Dynamic Blacklist) and the option to manage them using a button: