how to delete contents Under history --->Recently closed Window?
how to delete the contents under History-->RECENTLY CLOSED WINDOW?
how to delete the contents under History-->RECENTLY CLOSED WINDOW?
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Restore that window and close all open tabs in it.
Set the pref browser.tabs.closeWindowWithLastTab to false on the about:config page to prevent closing the last tab from closing the browser and make a close button appear if only one tab is open.