how do I clear the recently closed tab history
When I clear the history I find that it has no affect on the recently closed tab history. How do I clear it and protect my privacy. The tab history defeats the purpose of clearing the history because every site you were on is still listed.
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You can (temporarily) set the pref browser.sessionstore.max_tabs_undo to 0 to clear the "Recently Closed Tabs" list.
If you want to re-use the "Recently Closed Tabs" feature (Undo Closed Tabs) then you can reset the pref browser.sessionstore.max_tabs_undo to the default value via the right-click context menu.