Do not panic. Your machine is not obsolete yet. This guide will walk you through everything you need to know about locating, downloading, and installing the for Mac OS X 10.10.5 Yosemite, why you need the specific Extended Support Release (ESR) , and how to perform the update safely.
: You can download Firefox 130+ or the latest 2026 build on OS X 10.10.5 by bypassing system requirements. firefox download for mac 10105 upd
Instead, the most recent and secure version available for your system is . Why You Need a Specific Version Do not panic
If you cannot upgrade your OS, Firefox 78.15.0 ESR is your stopgap. However, for your own cybersecurity, it is highly recommended to look into upgrading your macOS version or considering a hardware upgrade soon. : You can download Firefox 130+ or the
Once the .dmg file finishes downloading, complete the local setup using the standard macOS installation process: