Mozilla has released Firefox 84. It brings WebRender to more systems including some Linux computers, it's the last version to support Adobe Flash and it now supports Apple Silicon CPUs natively.
Fedora 25, which launched over one year ago with the new Wayland display server, has now reached end-of-life meaning it'll no longer be updated. You should now upgrade to a newer version of Fedora.
Debian 10 "Buster", due for release in 2019, will likely ship with the new window manager, Wayland, but will also come with X11 as a fallback in case people's hardware doesn't support it.