Really? Chromium already has a fairly functional Wayland port [0] and Firefox just needs to upgrade to GTK 3, which is (admittedly optimistically) targeted for 32 [1].
[0] https://01.org/ozone-wayland/blogs/tiagovignatti/2013/chromi...
[1] http://worldofgnome.org/optimistic-target-for-firefox-gtk3-i...
EDIT: Now running the GTK 3 Firefox port in a GNOME Wayland session, and it's working great!