Please update to Firefox 18.0.1 Update Firefox to the latest release

Then read Delete browsing, search and download history on Firefox

You can (temporarily) set the browser.sessionstore.max_tabs_undo pref 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 browser.sessionstore.max_tabs_undo pref to the default value via the right-click context menu.

• http://kb.mozillazine.org/browser.sessionstore.max_tabs_undo

You can temporarily set the browser.sessionstore.max_windows_undo pref to 0 to reset the "Recently Closed Windows" list.

• http://kb.mozillazine.org/browser.sessionstore.max_windows_undo

Firefox will remember one window if you open additional windows and close that window while tabs are open in that window and the max_windows_undo is set to 0.

Close all tabs in a window before closing that window to prevent the window from appearing in the recently closed windows list.

• Note that this may not be possible with a pop-up window.

Set the browser.tabs.closeWindowWithLastTab pref to false on the about:config page to prevent closing the last tab from closing that window.

i'm running firefox 20.0.1; even when i'm not in private browsing, i still am able to see my recently closed tabs and windows--which i thought was the whole idea for private browsing mode; that once closed. no one whould be able to see this.

what's the explanation for this, and how can mozilla prevent this from occurring?

in the tools/options tab, my firefox is set to remember nothing ,and to use custom settings for history.

advice appreciated. thanks

hi,

i've been using ffox 20.0.1, with "use custom settings for history" checkmarked.

whenever i use private browsing, "recently closed windows" and "recently closed tabs" are still accesssible. why? and how can i fix this; otherwise, private browsing isn't private, correct?

thanks for your help.