For me, Nintendo refuses to register passkeys on both desktop Firefox (Librewolf), and IronFox (on /e/OS). Something about unsupported browser of device.
Unless they don't provide ARM downloads or have some other problem, couldn't you just use the ARM version, because part of what QEMU is is an emulator, to emulate other architectures?
If you're not against them, you could try vertical tabs with the Sidebery extension. It has a shortcut (not bound by default) to flip between the pervious tab and current tab.
We now all live in a recursive loop.