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Maybe it's because FF isn't configured to run with wayland? Check "window protocol" in about:support and make sure to run it with the MOZ_ENABLE_WAYLAND=1 env var.

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My system runs on X11 though

oh, sorry, I know recent versions of Ubuntu come with Wayland by default

It's actually PopOS 21.04, so pretty recent. Wayland is available if I wanted to ise it, but I remember running into other issues when tried.

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