The upgrade is a major one, considering that Firefox 91 includes all the functionality that Mozilla introduced since the release of Firefox 78 ESR. Organizations and home users who are running the current ESR version may update their installations to the new version. ![]() The version will be supported for about a year. The latter will see two additional releases, Firefox 78.14 ESR and Firefox 78.15 ESR before it will be discontinued this will happen in October 2021.įirefox 91 ESR marks the beginning of a new base for extended support releases. Two Firefox ESR branches are released side-by-side for a period of two or three releases usually, before the older one is not updated anymore this gives organizations and home users enough testing and migration time.įirefox 91 ESR won't replace Firefox 78 ESR right away. The last Firefox ESR version, Firefox 78 ESR, was released in June 2020, and it replaced Firefox 68 ESR in September 2020. ![]() Security updates and bug fixes are released, but features are not added usually until the next ESR version is released. ![]() One core difference is that they are released with a specific feature set that is not changed during the lifetime. Firefox ESR versions are maintained for a longer period compared to stable releases.
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