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Firefox 115 ESR still supports Sierra until next year: https://support.mozilla.org/en-US/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support https:

by rzzzt 2y ago

Firefox 115 ESR still supports Sierra until next year: https://support.mozilla.org/en-US/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support https://support.mozilla.org/en-US/kb/firefox-users-macos-101...