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History panel opens in left side of window every time I open a Firefox session. How do I turn it OFF?

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Windows forced a reboot while I had a Firefox window open with the History Panel (ctl+H) open on the left side of the window. Every since then, whenever I start Firefox, that history panel opens with it in the left side of the new window. How do I stop that?

Windows forced a reboot while I had a Firefox window open with the History Panel (ctl+H) open on the left side of the window. Every since then, whenever I start Firefox, that history panel opens with it in the left side of the new window. How do I stop that?

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You can check for problems with the localstore.rdf file.