What most people are not aware of is that even if one tell Firefox not to save browsing history, it is still possible to access the last 10 closed tabs (History->Recently Closed Tabs).So to clear the "Recently Closed Tabs list", in Firefox address bar type about:config, and set the key browser.sessionstore.max_tabs_undo to 0.
** about:config is the page where user preferences can be viewed and modified in firefox.
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