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Sidebar doesn't persist
I've been using Firefox for years on Windows 10 and earlier, and I just got a new Windows 11 laptop. On the new machine my bookmarks sidebar doesn't persist. I launch Firefox and open it, but when I exit Firefox and launch it again the sidebar is gone. I have to re-open it every time. This is not the behavior I experience on my other machines. Is there a setting in about:config that I need to change?