Prevent Firefox from saving page navigation history (and POST data) of closed tabs
Some websites (even HTTPS websites) send my password through a POST request. Even after I log out and close the tab, by reopening the tab and going back to resend the POST request, one can easily log in again into my account. I think that is insecure. How do I prevent that?
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See:
You can set the browser.sessionstore.privacy_level pref to 2 (never) or 1 (non-HTTPS) on the about:config page to disable saving cookies via session restore.
The browser.sessionstore.privacy_level_deferred pref is used when you do not reopen the previous session automatically via "Show my windows and tabs from last time" and uses the same values.
Thanks for your reply, but I think you don't understand me. I want session restore to restore the open tabs and the sessions across browser sessions. But I want the browser to forget the session of a closed tab without me restarting the browser!
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.