The Mozilla foundation has released several security vulnerability fixes for Firefox 65.0.1, Thunderbird 60.5.1 and Firefox ESR 60.5.1 on Tuesday and Thursday, February 12 and 14, 2019. These vulnerabilities include 5 high rated impacts.
The vulnerabilities addressed with these security updates are:
High
The Guyana National CIRT recommends that users and administrators review the update and apply them where necessary.
Reference
https://www.mozilla.org/en-US/security/advisories/mfsa2019-04/
https://www.mozilla.org/en-US/security/advisories/mfsa2019-05/
https://www.mozilla.org/en-US/security/advisories/mfsa2019-06/