A security prompt from Apple's Gatekeeper may appear, stating: "Firefox is an application downloaded from the Internet. Are you sure you want to open it?" Click to confirm. Important Security and Usage Considerations
To help find the safest setup for your machine, let me know: What are failing to load for you?
If you want to transition your workflow to a more modern environment, let me know. I can check your exact to see if it supports a patched upgrade to macOS High Sierra or Catalina , or help you find alternative lightweight browsers tailored for older hardware. Share public link
– this is the last version compatible with 10.10.5.
| Firefox Version | macOS 10.10.5 | Security Updates | |----------------|---------------|------------------| | Firefox 78 ESR | ✅ Yes | ❌ No (EOL) | | Firefox 79+ | ❌ No | N/A | firefox download for mac 10105 upd
How to Download Firefox for Mac OS X 10.10.5 (Yosemite) If you’re still using a classic Mac running OS X 10.10.5 Yosemite
Firefox 78.15.0esr (Extended Support Release).
. It no longer receives security updates, meaning using it may expose your system to vulnerabilities. Modern Requirements : Current Firefox releases require a minimum of macOS 10.15 Mozilla Support How to Download and Install Since the main Mozilla Download Page
Enter . While Mozilla has officially moved on to newer versions of macOS, you can still get a functional, stable version of Firefox for your Yosemite machine. Here is everything you need to know to get back online. The Best Version for Yosemite: Firefox 78 ESR A security prompt from Apple's Gatekeeper may appear,
Firefox 78 ESR cannot read profiles from Firefox 90+. Create a fresh profile: /Applications/Firefox.app/Contents/MacOS/firefox-bin -P
+--------------------------+-----------------------------------------------------------+ | Challenge Area | Impact on OS X 10.10.5 Users | +--------------------------+-----------------------------------------------------------+ | Security Vulnerabilities | No security patches since late 2021; open to modern exploits. | | Broken Layouts | Modern web frameworks (CSS/JS) may fail to render properly. | | SSL / TLS Errors | Outdated root certificates can cause "Your connection is not private" errors.| | Extension Support | New extensions on the Mozilla Add-ons marketplace will not install. | +--------------------------+-----------------------------------------------------------+ Alternative Solutions for Older Mac Hardware
If Firefox 78.15.0esr fails to load the websites you need, consider these alternative approaches to prolong the life of your hardware: Firefox 78.0, See All New Features, Updates and Fixes
Eject the disk image by dragging the Firefox installer icon from your desktop to the Trash bin (which turns into an Eject symbol). Step 3: Launching for the First Time Open your folder and double-click Firefox . If you want to transition your workflow to
The last version of Firefox that supports Mac OS X 10.10 is (Extended Support Release).
, you may have noticed that many modern browsers no longer support your operating system. However, you can still get a functional and relatively secure version of Firefox to keep your machine surfing the web. The Last Compatible Version: Firefox 78 ESR
Double-click the downloaded file to mount the disk image.
Apple no longer supports OS X Yosemite, but Mozilla has historically provided extended support releases (ESR) for older Macs. This article will walk you through exactly how to find, download, install, and troubleshoot , ensuring you get the final secure update available.