Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

Avatar for Username

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

Wotu tread sia eye woyi archive me. Meɖekuku bia biabia yeye ne ehia kpeɖeŋu.

Lost previous Firefox, cannot load replacement

SuMo Bot
SuMo Bot
more options

I am using mac OS X 10.11.6. I will not be updating my OS X because newer OS X versions are incompatible with applications I use for my job.

I went to your site offering the latest version of Firefox. While going thru the download process, it asked if I wanted to replace my previous version, so I selected 'yes'.

After continuing, I received an alert saying this version was not compatible with my OS X. I went back to download my older version and cannot find it available anywhere. So now I have no Firefox. Where can I obtain the last version supported by mac OS X 10.11.6?

I am using mac OS X 10.11.6. I will not be updating my OS X because newer OS X versions are incompatible with applications I use for my job. I went to your site offering the latest version of Firefox. While going thru the download process, it asked if I wanted to replace my previous version, so I selected 'yes'. After continuing, I received an alert saying this version was not compatible with my OS X. I went back to download my older version and cannot find it available anywhere. So now I have no Firefox. Where can I obtain the last version supported by mac OS X 10.11.6?

All Replies (2)

James (doing minimal support dowdays)
James (doing minimal support dowdays)
  • Top 25 Contributor
  • Moderator
more options

Firefox ever since 79.0 and later has required macOS 10.12 (ten.twelve) at minimum to run.

https://support.mozilla.org/en-US/kb/firefox-mac-osx-users-esr

The most current you can run on the old EOL macOS 10.9, 10.10, 10.11 is Fx 78.15.0 ESR released back on October 5, 2021.

https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/en-US/ for other locals see https://archive.mozilla.org/pub/firefox/releases/78.15.0esr/mac/

SuMo Bot
SuMo Bot Biabia la
more options

This question has been locked because the original author has deleted their account. While you can no longer post new replies, the existing content remains available for reference.