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Bookmark sidebar always open when I start Firefox. How to prevent?

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Upon starting Firefox, the bookmarks sidebar is always open. It is a nuisance to constantly need to close it. This has never happened before. It suddenly started a couple weeks ago and now the sidebar is open each morning I open Firefox. I can't find any options for it in the menu. Just the temporary closing. Using Firefox 26.

Upon starting Firefox, the bookmarks sidebar is always open. It is a nuisance to constantly need to close it. This has never happened before. It suddenly started a couple weeks ago and now the sidebar is open each morning I open Firefox. I can't find any options for it in the menu. Just the temporary closing. Using Firefox 26.

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You can check for problems caused by a corrupted localstore.rdf file.