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Re:Understanding the working of X11 from the ground up (2017) by jchw on Tuesday September 24, 2019 @04:07PM (#21064068)
I may have done something wrong. I am not highly knowledgable here. For example, I just learned of Pipewire.

That said, the problem occurred for me when using the NixOS package firefox-wayland. It is possibly better to use upstream firefox with Wayland, but I have not tried; I am just running firefox on Xwayland for now.

Re:Understanding the working of X11 from the ground up (2017) by MayeulC on Thursday September 26, 2019 @08:24AM (#21080245)
I don't know how the Firefox package is built on NixOS, but I just run the one from Arch Linux with the following environment variables:

    MOZ_WEBRENDER=1 MOZ_USE_XINPUT2=1 GDK_BACKEND=wayland