However, you can still install a working version of Firefox on your Mac, but you must install an older version (Firefox 78.15.0 ESR).
that still receives security updates for older macOS versions? Update Firefox to the latest release - Mozilla Support
: Firefox version 78 was the last to support OS X 10.9 Mavericks, 10.10 Yosemite, and 10.11 El Capitan. Security Status : Support for this version ended in October 2021
If your hardware allows, upgrading to macOS 10.13 (High Sierra) would let you run Firefox 115 ESR , which is significantly newer and more secure. How to update outdated browser on OS X Yosemite
(Change en-US to your language, e.g., de , fr , ja ).
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However, you can still install a working version of Firefox on your Mac, but you must install an older version (Firefox 78.15.0 ESR).
that still receives security updates for older macOS versions? Update Firefox to the latest release - Mozilla Support
: Firefox version 78 was the last to support OS X 10.9 Mavericks, 10.10 Yosemite, and 10.11 El Capitan. Security Status : Support for this version ended in October 2021
If your hardware allows, upgrading to macOS 10.13 (High Sierra) would let you run Firefox 115 ESR , which is significantly newer and more secure. How to update outdated browser on OS X Yosemite
(Change en-US to your language, e.g., de , fr , ja ).