Intermittently Firefox reverts to opening its windows maximized.  I expect it to remember last size and revert to that.  Ubuntu 18.04, latest patches, Firefox as supplied with Ubuntu, default GNOME desktop.  When I was 17.04/Unity desktop (if that matters) it did re-open at same (non-maximized) size as last time I closed it.  Now it sometimes does that, and that continues to work for a while, but sometimes reverts to always opening maximized, which I don't want.  As of today, for example, no matter what I do in the way of closing it, it re-opens maximized.  I tried created a new temporary profile, but that didn't seem to change behaviour.  I have done nothing "special" that I am aware of since it last worked, and I cannot figure how to get desired behaviour back.   Does anyone else suffer this intermittent behaviour? Does anyone know what I can do to sort this out? If it is saving this setting somewhere in the profile (~/.mozilla/firefox/xyz.default/), which exact file is it in?
Each time I open any application, it zooms to fill-up the entire desktop and so I am always forced to use "Unmaximize" using Alt+Space menu.
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