If someone tries this, tell me if it launches at all. I'm seeing one bug report in the Open Store but can't ask the user for more details so I can try to fix it. Thanks!

Thanks for the suggestion. I'm reusing SliderMenu from Lomiri for the sliders and there seems to be some inherent limit on how much spacing I can remove. Or I haven't been looking in the right places.

lomiri-settings-components/plugins/Lomiri/Settings/Menus/SliderMenu.qml

That's an interesting suggestion. If they want it, I'm more than happy to contribute. I just don't know what they think of keeping a flag for this particular quirk of this particular Wayland-compatible server.

Maybe in Firefox 138 and earlier it'd have been easier because very few lines change. I don't have a patch for the latest Firefox though and would only work on it if I know Moizlla wants it.

Upstream to where? Someone working on UT said they're working on Mir/qmir which could potentially make the patching unnecessary. But seems like that's not working yet.