Firefox Needs a Backport

[Bug Report]

There is a need to get a more updated firefox--esr in Debian Stretch 
Stable Backports.  The latest Firefox is 66, but stable is still only up 
to 60, and I am getting error messages from various websites advising 
that the browser I have is not compatible with the website's content.  
Although Firefox is now part of the Debian repository there is still a 
need for backports in order to get a more current version of Firefox.