Firefox to End Support on MacOS Mojave (also High Sierra / Sierra) in September 2024

Mozilla has announced that support for Firefox will end in September 2024 for MacOS Sierra / High Sierra / Mojave with Firefox ESR 115 :

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...

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Author: Jamesbond007