At least if you use Guix (no need to use the entire GuixSD), GNU IceCat has a beta update to version 45, see: <https://listas.trisquel.info/pipermail/trisquel-users/2016-October/071602.html> and also <http://lists.gnu.org/archive/html/guix-devel/2016-10/msg00570.html>.
I'm using it now, with GNU LibreJS also.
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