Firefox version 78 is the last supported Firefox version for Mac 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 Extended Support Release (ESR) channel by an application update. This will provide security updates until the next ESR update in July 2021, after which the affected users will no longer receive security updates.

While Apple does not have a public policy governing security updates for older OS X releases, their ongoing practice has been to support the most recent three releases. The last security update applicable to OS X 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.

Up until July 2021, we will be updating affected users with critical security updates through the Firefox ESR channel to help retain the best possible security. After this, no security updates will be provided.

If you want to keep your Firefox version up to date, you will need to upgrade your operating system to macOS 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.

This Version Of 10.11 Cannot Be Installed

• I too, am wondering about this as my mid-2009 MacBook Pro is capped at os 10.11.6 and cannot download the current version of remote desktop. I need to be able to connect to my work computer from home during this time. I have exactly the same problem. I have an older macbook (pre 2009 i think), El Capitan v10.11.6.
• Hi,So in this tutorial, I am going to show you how to Install Mac OS X El Capitan On VMware Workstation 12 running on Windows 10/8.1/7 This is extremely ea.
• Jul 23, 2019 My MacBook Pro 2009 cannot be upgraded from 10.11 to OSX 10.12. The latest Office 365 will only run on 10.12. I followed the solution of another client and installed the older version of Office 365, which can be installed on OS X 10.11.

This Version Of Os X 10.11 Cannot Be Installed On This Computer Download

15:51 $ systemprofiler SPSoftwareDataType Software: System Software Overview: System Version: OS X 10.11 (15A284) Kernel Version: Darwin 15.0.0 Boot Volume: Macintosh HD Boot Mode: Normal Secure Virtual Memory: Enabled. Install older OS X onto an external drive. The following method allows you to download Mac OS X Lion, Mountain Lion, and Mavericks. Start your Mac holding down Command + R. Prepare a clean external drive (at least 10 GB of storage). Within OS X Utilities, choose Reinstall OS X. Select external drive as a source. Enter your Apple ID.