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previous session tabs not showing at startup

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When I close down Firefox for the night, and start it up again in the morning, all of my previous tabs are gone! (Yes, I have the setting: "at startup - show my windows and tabs from last time" is selected)

When I close down Firefox for the night, and start it up again in the morning, all of my previous tabs are gone! (Yes, I have the setting: "at startup - show my windows and tabs from last time" is selected)

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If you use Delete browsing, search and download history on Firefox in Firefox 3.5 and later to clear the 'Browsing History' when you close Firefox then restoring tabs from the last session ("Save & Quit" or "Show my windows and tabs from last time") doesn't work.

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I think I might have done that once... so, now do I uninstall it and re-install?