Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Most modern version of Firefox that will work on OS 10.10.15

  • 1 reply
  • 0 have this problem
  • 11 views
  • Last reply by James

more options

Hello,

I'm looking to download and run the most most recent version of Firefox that will work on a Mac running OS 10.10.15. Where can I find it, and is there anything special I need to make it work?

Thanks in advance.

Hello, I'm looking to download and run the most most recent version of Firefox that will work on a Mac running OS 10.10.15. Where can I find it, and is there anything special I need to make it work? Thanks in advance.

All Replies (1)

more options

Firefox 79.0 and later requires Mac OS X 10.12 (ten.twelve) at minimum to run. For the old Mac OSX 10.9, 10.10, 10.11 users the last version to still support was Firefox 78.15.0esr. Firefox 78.15.0esr.dmg https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/en-US/ other locales. https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/


An alternative is to try SeaMonkey as support for 10.9 to 10.10 has theoretically been restored for 2.53.16b1 and up. http://forums.mozillazine.org/viewtopic.php?p=14950301#p14950301 https://www.seamonkey-project.org/releases/#2.53.16

SeaMonkey is the community effort to keep the old Mozilla suite running after Mozilla stopped supporting it many years ago.