When you click this extension icon, it will show you the storage used info of current (https) site. You can clear data for current site or all web sites, including these data types: Cache ● Browser Cache ● Cache Storage Storage ● Local Storage ● IndexedDB ● Web SQL ● Cookies ● Service Workers ● File Systems Others (only when select for all web sites) ● Download List ● Visited History ● Stored Form Data ● Stored Passwords When you select clearing data for all web sites, you can add excluded origins which are excluded from deletion.