Mozilla sent Firefox Version 84.0.2 to the release channel today with a critical security update for Firefox, Firefox ESR, Firefox for Android.
Firefox ESR was updated to Version 78.6.1.
Update: To get the update now, select "Help" from the Firefox menu, then pick "About Firefox." Mac users need to select "About Firefox" from the Firefox menu. If you do not use the English language version, Fully Localized Versions (https://www.mozilla.org/en-US/firefox/all.html) are available for download.
Security Updates (https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/)
Release Notes (https://www.mozilla.org/en-US/firefox/84.0/releasenotes/)
Firefox ESR Release Notes (https://www.mozilla.org/en-US/firefox/78.6.1/releasenotes/)