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browser.sessionstore.resume_session_onceOf course, however, I don't want to be monkeying around with my about:config every time I want this to happen: there should be a button of some sorts that you click and voila, session save is on for just this particular session.
Could I achieve this with, say, a bookmarklet? This would be definitely achievable with a Firefox extension, but I doubt anyone's come out with an extension yet (most of them are not based on the integrated sessionstore functionality), and I'm not so savvy on having to write one out myself.