The newest Mac that isn’t supported by High Sierra is a 2009 model, and so is more than eight years old. And High Sierra will keep getting security updates for a couple more years, so a Mac will be more than ten years old when it can no longer run a supported version of MacOS. – Mike Scott Mar 6 '18 at 2:35. For example, it might say that your Mac doesn't have enough free storage space for the installation, or that the installer is too old to be opened on this version of macOS. If you want to check compatibility before downloading the installer, learn about the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan.
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A multi-platform web browser with open source code
Mozilla Firefox browser is a fast, full-featured Web browser. Firefox includes pop-up blocking, tab-browsing, integrated Google search, simplified privacy controls, and much more. Last update 28 Sep. 2011 old versions Licence Free OS Support Mac OS X Ranking #1 in Internet Tools.
Older versions of Firefox
![Firefox Firefox](/uploads/1/1/8/9/118943742/943285727.png)
82.0.3 Nov 10th, 2020
78.0.2 Jul 22nd, 2020
77.0.1 Jun 24th, 2020
77.0 Jun 3rd, 2020
72.0.1 Jan 16th, 2020
72.0.1 Jan 16th, 2020
72.0.1 Jan 16th, 2020
Firefox For Older Mac
72.0.1 Jan 16th, 2020
72.0.1 Jan 16th, 2020
Mozilla Firefox For Mac 10.5.8
72.0.1 Jan 16th, 2020