A new Firefox 77.0.1 will be released https://www.mozilla.org/en-US/firefox/77.0.1/releasenotes/ not yet updated
Available through builtin updater.5mb
Mozilla plans to release Firefox 77.0.1 to the Stable channel later today for more info go here.. https://www.ghacks.net/2020/06/03/firefox-77-0-1-will-be-released-today-to-fix-one-issue/