Recommend that might still work on older Firefox versions.
Mozilla no longer links old versions directly. Use the :
), released back in 2015, no longer receives security updates from Apple, leaving it vulnerable. As of June 2026, finding a "Firefox download for Mac 10.10.5 updated" means finding the last compatible version that still provides a balance of web compatibility and security patches, even if it is not the absolute latest Firefox release. 1. The Challenge with Old macOS Versions firefox download for mac 10105 upd
Some modern websites may display improperly or not work at all because they require newer web standards.
Running an older Mac with OS X 10.10.5 Yosemite doesn't mean you have to give up on web browsing. While modern, secure browsers often require newer operating systems, Firefox offers a pathway for older machines to stay functional. Recommend that might still work on older Firefox versions
Mainstream Firefox (Versions 78+) dropped support for OS X 10.10 and 10.11 in mid-2021. The last compatible series is Firefox 78 ESR (Extended Support Release). However, a later ESR – Firefox 91 ESR – initially required macOS 10.12+. But community reports indicate Firefox 78.15.0esr is the final official build for 10.10.5.
: Open your Applications folder and double-click Firefox. You might see a warning that it was "downloaded from the internet"—just click Open . Pro Tips for Older Macs Browser Suggestions for Old Mac Laptop Yosemite 10.10.5 As of June 2026, finding a "Firefox download for Mac 10
To download and install Firefox on your Mac, follow these steps:
The latest Firefox versions require . Your Mac will also need an Intel x86 or Apple Silicon processor and at least 512 MB of RAM.
Sites like MacUpdate and Uptodown also maintain historical versions of the Firefox .dmg files. How to Install
When we talk about "updated" for a 10.10.5 machine, we often mean moving from a much older version (like 40 or 50) to the final 78 ESR. Open your current, older Firefox.