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Firefox is moving macOS 10.9, 10.10 and 10.11 users to the Extender Support Release (ESR) channel.

[[Find what version of Firefox you are using|Firefox version]] 78 is the last supported Firefox version for macOS users of OS X 10.9 Mavericks, OS X 10.10 Yosemite and OS X 10.11 El Capitan. These users will be moved to the Firefox [https://www.mozilla.org/en-US/firefox/enterprise Extended Support Release] (ESR) channel by an application update. This will provide security updates until the next ESR update of summer 2021, after which the affected users will no longer receive security updates. =Why has Firefox ended support for macOS 10.9, 10.10 and 10.11 users?= While Apple does not have a public policy governing security updates for older macOS releases, their ongoing practice has been to support the most recent three releases. The last security update applicable to macOS 10.11 was made available in July 2018. Unsupported operating systems do not receive security updates, have known exploits, and can be dangerous to use, which makes it difficult to maintain Firefox on those versions. =Can I still browse safely with Firefox on macOS 10.9, 10.10 or 10.11?= Up until summer 2021 we will be updating affected users with critical security updates through the [https://www.mozilla.org/en-US/firefox/enterprise Firefox ESR] channel to help retain the best possible security. After this no security updates will be provided. =How can I get the newest features of Firefox?= If you want to keep your Firefox version up to date, you will need to upgrade your operating system to mac OS X 10.12 or higher. Older versions that are not supported by Apple are unreliable and unsafe to use, which also makes it difficult to maintain Firefox on those versions.