xcompose
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XCompose and Firefox, GTK applications.
Executive summary: export GTK_IM_MODULE=xim
Should go live in the README.
https://wiki.ubuntu.com/ComposeKey#Configuration_for_Gtk_Applications_.28Gnome.2C_FireFox.2C_etc..29
Also, it seems the include
directive is not supported in GTK :-(
Compare https://gitlab.gnome.org/GNOME/gtk/blob/master/gtk/gtkcomposetable.c#L243