FirefoxESR

For security purposes, I would prefer to use FirefoxESR. How do I use this instead?

https://software.opensuse.org/package/firefox-esr

This is Older version ( 38.8 )

From the 8 March 2016 - 45.0esr ( https://www.mozilla.org/en-US/firefox/45.0esr/releasenotes/ )

Hi
Older does not mean unsupported, security fixes are backported…
https://build.opensuse.org/package/view_file/mozilla/firefox38esr/firefox-esr.changes?expand=1

OK.
This is from the https://wiki.mozilla.org/Enterprise/Firefox/ExtendedSupport:Proposal

https://wiki.mozilla.org/images/9/9d/Esr-release-overview.png