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Mozilla has announced that support for Firefox will end in September 2024 for MacOS Sierra / High Sierra / Mojave with Firefox ESR 115 :
support.mozilla.org
Firefox users on MacOS Sierra / High Sierra / Mojave will be switched to the ESR channel via an "application update" when Firefox 115 is released in July 2023. Then Firefox ESR 115 will be provided with security updates on these operating systems until September 2024. After that there will be no more security updates available. Future versions of Firefox and Firefox ESR will not run on these operating systems.
Firefox users on macOS 10.12, 10.13 and 10.14 moving to Extended Support Release | Ayuda de Firefox
Firefox version 115 ESR will be the last supported release for macOS 10.12, 10.13 and 10.14

Firefox users on MacOS Sierra / High Sierra / Mojave will be switched to the ESR channel via an "application update" when Firefox 115 is released in July 2023. Then Firefox ESR 115 will be provided with security updates on these operating systems until September 2024. After that there will be no more security updates available. Future versions of Firefox and Firefox ESR will not run on these operating systems.
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