Hi,

• Firefox version 79 is compatible with macOS 10.12 and higher.
• Firefox version 128 is compatible with macOS 10.15 and higher.

So you can't update it. Firefox 78.15.0 ESR it the last one for your OS.

Thank you.

Hi,

• Firefox version 79 is compatible with macOS 10.12 and higher.
• Firefox version 128 is compatible with macOS 10.15 and higher.

So you can't update it. Firefox 78.15.0 ESR it the last one for your OS.

A minor correction. It is Firefox 116.0 and later that requires macOS 10.15 and higher to run.

https://www.mozilla.org/firefox/116.0/system-requirements/ https://www.mozilla.org/firefox/115.0/system-requirements/

Hi, thanks but it doesn't solve my problem as I need an upgrade compatible with my macOS 10.9.5 otherwise I will lose Firefox browser rather soon and it's the only one I can use on my vintage computer ! Same issue with a macbook OSX Capitan 10.11.6… :(

Hi, thanks but it doesn't solve my problem as I need an upgrade compatible with my macOS 10.9.5 otherwise I will lose Firefox browser rather soon and it's the only one I can use on my vintage computer ! Same issue with a macbook OSX Capitan 10.11.6… :(

For macOS 10.9, 10.10, 10.11 the most current Firefox you can run is Firefox 78.15.0esr. Firefox 79.0 to 115 requires macOS 10.12, 10.13, 10.14 to run.

The Firefox 78.15.0esr.dmg is in below links. https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/en-US/ other language locales https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/

Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release https://support.mozilla.org/en-US/kb/firefox-mac-osx-users-esr

If you Macbook can upgrade to macOS 10.12 or later then you can use Firefox 115 ESR which is currently still getting updates support till at least 115.21.0esr in March 2025. https://support.mozilla.org/en-US/kb/firefox-users-macos-1012-1013-1014-moving-to-extended-support