If your hardware allows it, experts recommend upgrading your macOS to at least 10.15 Catalina
– Avoid animated or heavy themes.
78.15.0esr/mac/en-US/
, it remains the most functional official version for your OS. Where to Download: You can find older versions in the Mozilla release archives or through reputable community repositories like the Macintosh Repository How to Install Download the DMG: Locate the installer for Firefox 78.15.0esr. Open the File: Double-click the downloaded Drag to Applications: Drag the Firefox icon into your Applications Confirm the Version: Open Firefox, go to the top menu, and select Firefox > About Firefox to ensure you are on version 78. Critical Security Warning firefox download for mac 10105 upd
The final version of Firefox compatible with Mac OS X 10.10.5 is . Version Number: 78.15.0esr If your hardware allows it, experts recommend upgrading
You can find the specific installer on the Mozilla Release Archive. Open the File: Double-click the downloaded Drag to
A: The modern Firefox codebase uses APIs (Application Programming Interfaces) from macOS 10.12 Sierra and above. Modifying the binary would break core rendering.