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Folder navigation panel missing

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When using files in Firefox, for example when sending files in facebook, the left folder navigation panel is missing. Tried enable then disable it with no luck.

When using files in Firefox, for example when sending files in facebook, the left folder navigation panel is missing. Tried enable then disable it with no luck.

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I think you have accidentally closed the navigation panel. To get it back, follow the screenshot. I have taken it on a windows-8 device but I think it has the same procedure on Windows 10.