Mozilla sent Firefox Version 42.0 to the release channel. The update includes three (3) critical, five (5) high, seven (7) moderate and two (2) low security updates.
Version 38.4.0 was released for Firefox ESR.
Mozilla Firefox Release Notes (https://www.mozilla.org/en-US/firefox/42.0/releasenotes/)
Security Updates (https://www.mozilla.org/security/known-vulnerabilities/firefox.html)
Thanks. I updated my two computers (ESR version) and will do my husband's two tomorrow.