NEW Firefox 59.0.3 Will be released by Mozilla later today. the Firefox builtin updater has been NOT UPDATED at this time Staged roll out?, Firefox 59.0.3 breaks compatibility with older versions of the browser and Firefox ESR. Users who want to downgrade are advised to back up their profiles prior to installing the update. Release notes NOT UPDATED https://www.mozilla.org/en-US/firefox/59.0.3/releasenotes/
https://www.mozilla.org/en-US/firefox/59.0.3/releasenotes/ released