Firefox regularly either crashes, or locks up on me and has to be killed. ''Most'' of the time, it restores my previous session just fine, but sometimes it doesn't. This is really, really maddening, as I lose usually 20+ tabs' worth of work - and since some of these tabs were originally opened on previous days (and restored the "last" time I had to restore a session), there is no practical way to track them back down. (That is, it requires going through weeks' worth of history, line by line.) This costs me many, many hours. Is there some way to manually save the session periodically (as a "session," not as bookmarks), so that if Firefox screws up and doesn't save the session, I still have something relatively recent? The built-in save session seems to be all-or-nothing - either it remembers everything, or it just wipes everything out and you have to start over.