Firefox Download For Mac 10105 Upd _best_ May 2026

Firefox Download for Mac 10105: A Step-by-Step Guide

Recommendation: While this version allows you to browse the web, it is no longer receiving security patches. For better security, consider upgrading your macOS if your hardware supports it (e.g., to macOS 10.15 Catalina). Where to Download firefox download for mac 10105 upd

• The cutoff: Mozilla dropped support for OS X Yosemite (10.10) and earlier versions starting with Firefox 79 (released July 2020).
• The last compatible version: For Mac OS X 10.10.5 specifically, the final working build is Firefox 78 ESR (specifically version 78.15.0esr).
• The “10105” in your search: This refers to the macOS build number (10.10.5). The “upd” likely refers to an "update" for that specific OS.

Or download from Mozilla’s official “Firefox for older Macs” page: Firefox Download for Mac 10105: A Step-by-Step Guide