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The upload window left sidebar went missing

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dschirch
dschirch
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In Gmail, when I try to attach a file, the Firefox upload window opens. It used to have a sidebar on the left (see picture from another computer) with a directory, including the option "Quick access." That is gone now, and I don't see any setting to restore it, not can I find any instructions online on how to restore that sidebar.

In Gmail, when I try to attach a file, the Firefox upload window opens. It used to have a sidebar on the left (see picture from another computer) with a directory, including the option "Quick access." That is gone now, and I don't see any setting to restore it, not can I find any instructions online on how to restore that sidebar.
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