some app without title bar doesn't keeped maximized after leaved fullscreen examples: - totem - gnome-box - firefox (with unchecked "show titlebar" on "customize")
Dupe of bug 14511 ?
(In reply to Olivier Fourdan from comment #1) > Dupe of bug 14511 ? yes but this bug is not limited to firefox
*** This bug has been marked as a duplicate of bug 14511 ***