Guardrails have been in place where the Firefox browser has enabled Wayland by default (when running on recent GTK versions) but as of today that code has been removed...
Wayland is a "display server," which basically means it manages the way GUIs show on the screen. X (most recently X11/Xorg) was the standard for over 30 years, but it was designed for computers 30 years ago. Modern concepts like scaling and high refresh rate displays need extensions to it, but it's really complicated and hard to work with, so a lot of improvements that need to be made can't be made. It's also fundamentally insecure, as every window has access to both the contents and the input of any other window. Wayland is a modern replacement that focuses on security and expandability, and basically everything is working on switching to it. There are growing pains, but it's constantly improving, and most distros use it by default now.
There are 2 display servers for Linux. X11, which is really old and doesn't support newer things such as HDR and the "new" kid on the hlock, Wayland. KDE, Gnome and such that make the UI you interact with on Linux utilize X11 or Wayland to render everything on the screens.
It sounds like Wayland is the new thing and it's been around long enough that everyone plays well with it, so it's going to be the default moving forward.
Saw the other comment about Linux and did some searching. Found it on Wikipedia; appears to be a window system for Linux or a protocol that enables a window system for Linux? Don't know enough about this stuff, but here's the link I found: https://en.m.wikipedia.org/wiki/Wayland_(protocol)
I don't know what people are expecting to happen with the Linux desktop. If there was ever a year of the Linux desktop, it was probably in the mid-2000s, when Ubuntu made the Linux desktop usable for regular people and promoted it with free installation CDs.
I'd say, by my metric of what "Year if the Linux Desktop" is, 2022 was that year. Absolutely everything came together and finally all clicked in. Not saying everything is perfect, but it works, works well, and has support for the majority of games made for Windows.
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Guardrails have been in place where the Firefox browser has enabled Wayland by default (when running on recent GTK versions) but as of today that code has been removed... Firefox will try to move forward with stable releases where Wayland will ship by default!
Mozilla Bug 1752398 to "ship the Wayland backend to release" has been closed this evening!
After the ticket was open for the past two years, it's now deemed ready to hopefully ship enabled for Firefox 121!
This patch drops the "early beta or earlier" check to let Wayland support be enabled by default when running on recent GTK versions (GTK 3.24.30 threshold).
Firefox 121 is due for release around 19 December and if all continues to hold, it will finally ship with the Wayland back-end enabled by default as another big step forward.
With KDE Plasma 6.0 using Wayland by default, XWayland rootful mode improving, and other (X)Wayland progress, 2024 could very well be the year of Wayland shining in the Linux desktop limelight.
I really hope they fix the issue with the picture-in-picture video not staying over top of all other windows; that's the only thing keeping me from using Wayland Firefox right now.