For users running macOS 10.10.5 (Yosemite), the most recent and final compatible version of Firefox is Firefox 78.15.0 ESR (Extended Support Release). This version reached its final update on October 5, 2021, and is no longer receiving security patches from Mozilla. Download Instructions
If you’re still rocking a Mac with OS X Yosemite (10.10.5), you know the struggle. Modern websites are heavy, and Safari 8 feels like it's trying to run a marathon in flip-flops. You need a browser that still respects your hardware while letting you actually check your email.
The challenge of living in this past is the narrowing window to the present: the web browser. As security protocols evolve, the modern web slowly "blinds" older machines. This is where Firefox 78 ESR (Extended Support Release) enters the story as a loyal companion. It was the final version to keep the lights on for Yosemite before the support bridge was officially dismantled in October 2021. firefox download for mac 10105 upd
For users running macOS 10.10.5 (Yosemite), the latest and final compatible version of Firefox is Firefox 78.15.0esr. Summary of Support
Website Compatibility: Many modern websites (like banking or high-security portals) may not load correctly or may flag your browser as "too old". For users running macOS 10
🔗 Mozilla FTP directory (safe, official):
https://ftp.mozilla.org/pub/firefox/releases/78.15.0esr/mac/
You should only download Firefox from official or reputable sources to ensure the file is safe: Modern websites are heavy, and Safari 8 feels
Once you’ve completed the firefox download for mac 10105 upd, speed up your legacy Mac: