https://bugzilla.mozilla.org/show_bug.cgi?id=157873
157873 - Some parts of Mozilla don't care about accelkey and menuaccesskey values
RESOLVED (matti) in SeaMonkey - General. Last updated 2004-11-22.
https://lazka.github.io/pgi-docs/Gtk-3.0/classes/AccelKey.html
Gtk.AccelKey - Structures - Gtk 3.0
gtkstructures