I have been waiting to see what will happen here. I thought I saw 
something which implied RHEL would support ESR 45, but it was very 
unclear (of course there were other changes like switch to GDK3 which 
made it sound like it couldn't happen). However I think the two ESR 
versions overlap for one or two releases, so it's possible that RHEL 
will not switch until ESR 38 truly comes to an end.

This bugzilla here is what made me think an update may indeed be planned:
https://bugzilla.redhat.com/show_bug.cgi?id=1297948

Graham

On 4/24/2016 9:51 PM, ToddAndMargo wrote:
>
> We are currently 38.7.0 ESR.  As far as ESR goes, it is on
> 45.0
>
> http://releases.mozilla.org/pub/firefox/releases/45.0esr/
>
> Pick and choose.