Anyone else see this in Firefox 60 on #ubuntu / GNOME? When *maximised* I can't click top ~50% of first four pinned tabs. Can click bottom ~50%. Note the tab highlights only work in bottom part of the tab. When not highlighted, clicking doesn't respond. Only affects first 4 tabs.
Thanks to excellent debugging from @sil we discovered it's this invisible force quit window stealing focus. Which was actually the Wine System Tray! Thanks go to xwininfo and xprop <3
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