Hi,

As of last nightly (20181115100051), Firefox now supports Wayland,
thanks to the work from Martin Stransky and Jan Horak, mostly.

Before that, it was possible to build your own Firefox with Wayland
support (and Fedora does it), but now the downloads from mozilla.org
come with Wayland support out of the box for the first time.

However, being experimental and all, the Wayland support is not enabled
by default, meaning by default, you'll still be using XWayland. To
enable wayland support, first set the `GDK_BACKEND` environment variable
to `wayland`.

To verify whether Wayland support is enabled, go to `about:support`, and
check "WebGL 1 Driver WSI Info" and/or "WebGL 2 Driver WSI Info". If
they say something about `GLX`, Wayland support is not enabled. If they
say something about `EGL`, it is. I filed a bug[1] to make it more
obvious what is being used.

It's probably still a long way before Firefox enables Wayland support on
Wayland by default, but we reached a major milestone here. Please test
and report any bug you encounter[2].

Mike

1. https://bugzilla.mozilla.org/show_bug.cgi?id=1507665
2. 
https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&component=Widget%3A%20Gtk
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