In the meantime, we strongly encourage our users to upgrade to mac OS X 10.12 or higher to benefit from the security and privacy updates.įor more information please visit the Firefox support page. On June 30th, these macOS users will automatically be moved to the ESR channel through application update. Users do not need to take additional action to receive those updates. Unsupported operating systems receive no security updates, have known exploits, and can be dangerous to use, which makes it difficult and less than optimal to maintain Firefox for those versions. The last security update applicable to macOS 10.11 was made available nearly 2 years ago in July 2018 ( ).
A Finder window appears, containing the Thunderbird application. If you do not see the new volume, double-click the Thunderbird dmg icon to open it. Once the download is completed, the disk image may open by itself and mount a new volume which contains the Thunderbird application.
While Apple doesn’t have an official policy governing security updates for older macOS releases, their ongoing practice has been to support the most recent three releases (i.e. Click on the macOS installation of your choice to continue. On June 30th, macOS 10.9, 10.10 and 10.11 users will automatically be moved to the Firefox Extended Support Release (ESR).
