For those with vision impairments the options you need to set to true
in about:config are:
widget.gtk.global-menu.enabled
widget.gtk.global-menu.wayland.enabled
Presumably you would only need the second option if you are using Wayland. I tried it (am using Plasma on Fedora 42) and it worked but I’m not interested in it so I disabled it after I made sure all the menus gave a drop down. YMMV.
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Such a shame. 💔