Mozilla released Firefox 81 Stable and Firefox ESR 78.3 to the public on September 22, 2020. The new versions of the Firefox web browser are available via automatic updates and also as direct downloads.
Firefox development channels have received updates as well. Firefox Beta and Developer versions move to version 82, Firefox Nightly to 83, and Firefox for Android is updated to version 81 as it follows the stable channel release scheme.
Check out the Firefox 80 release notes in case you missed them.
The release date of Firefox 81 and Firefox 78.3 ESR is September 22, 2020. The update is pushed via its automatic updating functionality to devices it is installed on; this is an automated process.
Users who don't want to wait can open Menu > Help > About Firefox to run a manual check for updates. The interface that opens displays the currently installed version of Firefox as well.
Users may also download the new version from Mozilla if they prefer that.
The following pages list direct downloads for supported Firefox channels (will be available later on September 22, 2020)
Firefox for Android has been updated to version 81 today as well. The new version is being rolled out via Google Play to all devices earlier versions are installed on.
Security updates are revealed after the official release of the web browser. You find the information published here after release.
Additional information / sources
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