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Disappearing history, bookmarks and Quantum icon after Quantum install.

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Installed Firefox Quantum. It worked perfectly all day and so did the history. Didn't notice the bookmarks. When I closed the app, the icon in the taskbar disappeared. I brought up the older version of Firefox and history and bookmarks are gone.

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So are bookmarks gone in both versions of Firefox ? Which was the version that had the issue ? How do you have both versions set up to run ? Is there a folder on the desktop called OldFirefoxProfile ?