Close & Clean

This extension will add "Close & Clean" button to your browser's toolbar. When you click the button it will close all currently opened tabs and windows and (depending on your settings) will clean Opera cache, history, cookies or other browsing data. You can set it to keep the current tab open, to close or keep alive pinned tabs and some other settings (see the "Options" page).

It could be useful if you work with many sites at once and want to have single shortcut to close them all and clean everything at the end of the session.

By default it will clear only the cache. It can delete other trash too -- cookies, history, saved passwords, app cache, download history, file systems, form data, indexed data etc. -- but you have to explicitly define what to be cleaned in the options page (right-click on the icon and select "Options").