Instead, the most recent and secure version available for your system is . Why You Need a Specific Version

: Many modern websites (like banking or high-security portals) may not load correctly or may flag your browser as "too old".

Modern browsers require newer system libraries that Yosemite lacks. If you try to run the current Firefox release, it will either refuse to install or crash upon opening. was the final version branch to support macOS 10.9 through 10.11. How to Download Firefox for Mac 10.10.5

: When you first open it, macOS may warn you that it’s an application downloaded from the internet. Click Open to proceed. Key Considerations and Risks

: This version received its final security update on October 5, 2021. It is now several years out of date and does not protect against modern web vulnerabilities.

If you are looking to download Firefox for , you have likely noticed that the latest versions of Firefox no longer support this operating system. Because Mozilla ended support for Yosemite in late 2021, you cannot simply download the standard "latest" version from the main Firefox website.

To get the correct version, you must access Mozilla’s archives. Follow these steps to ensure you are downloading from a legitimate source: