Ok, unmarking as duplicate. Locking the screen might be a trigger, but
in my case, this issue only happens sometimes.
** This bug is no longer a duplicate of bug 2002624
firefox maximize button gets hidden after the screen gets (un)locked
** Changed in: gnome-shell (Ubuntu)
Status: New => Confirmed
** Package changed: gnome-shell (Ubuntu) => firefox (Ubuntu)
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https://bugs.launchpad.net/bugs/2034724
Title:
minimize, maximize, close buttons in title bar become invisible
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