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Firefox slowed down to a crawl, and on restart it had lost all my open tabs.

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Exactly what I said. Any ideas on recovering the tabs? The Help documentation mentions a button on the default Firefox Start Page for opening the tabs from the last session, but I don't have such a button. Also, on the History menu, the option to "restore previous session" is greyed out. It's as if Firefox thinks it has never been run before.