If you need an even older version, platforms like Uptodown and MacUpdate host historical DMG files for various architectures.
For users who want modern features on truly "vintage" hardware, community-driven projects offer modified versions:
Download Old Version of Firefox [129.0.2 - 52.0.2...] for Mac download firefox legacy mac
The final supported version is available on the Mozilla CDN server as an en-US DMG file. 2. Third-Party Repositories (Use with Caution)
You can download the Firefox 115 ESR directly. This version will receive security updates until August 2026. If you need an even older version, platforms
If you are running an older Mac that can no longer update to the latest macOS, you have likely encountered "Your browser is no longer supported" messages. This is because modern browsers, including the standard Mozilla Firefox , require more recent operating systems to run safely.
Compatibility depends entirely on your current macOS version. Use the table below to identify the correct legacy release: macOS Version Version Name Last Supported Firefox Release Sierra, High Sierra, Mojave Firefox 115 ESR (Support through Aug 2026) OS X 10.9 – 10.11 Mavericks, Yosemite, El Capitan Firefox 78.15.0 ESR OS X 10.6 – 10.8 Snow Leopard, Lion, Mountain Lion Firefox 45.9.0 ESR (or community patches) Where to Download Firefox Legacy for Mac 1. Official Mozilla Extended Support Release (ESR) Third-Party Repositories (Use with Caution) You can download
However, "Legacy" versions of Firefox allow you to keep your older hardware functional while still accessing the modern web. This guide covers how to find, download, and safely use legacy versions of Firefox for your specific Mac hardware.