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.
Download the latest version of Malwarebytes for Mac. Note: If you are running OS X El Capitan 10.11, download this version of Malwarebytes for Mac. Locate the downloaded file Malwarebytes-Mac-4.x.y.zzz.pkg. 4.x.y.zzz represents the version number. In most cases, downloaded files are saved in the Downloads folder. Install OS X El Capitan 10.11.6.iso. Install OS X El Capitan 10.11.6.iso (7.14 GB) Choose free or premium download. Download El Capitan.DMG from here. Download DiskMaker X. To do in Windows, we already shared a very specific instruction from here: Make Bootable Installation USB from Mac OS X.DMG on Windows PC. At for Mac users, there will be 2 doable methods. METHOD 1: Using DiskMaker X. Run, DiskMaker X, then.choose El Capitan (10.11). This fifth release of OS X is only available as a free download for Mac users. To install it you must have a Mac that is compatible with El Capitan. This version of OS X shares compatibility with the previous version, OS X 10.10 aka Yosemite.Here are the Mac systems with which El Capitan is compatible:- iMac (Mid 2007 or newer)- MacBook Air.
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.
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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.
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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.