This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

Older Firefox version

  • 2 replies
  • 1 has this problem
  • 57 views
  • Last reply by James

more options

I have received several notices telling me that I was running an older version of Firefox and that I should update. I was running Firefox 78 on a 2007 iMac version 10.11.6 I downloaded the newest version of Firefox, 91 and without checking I replaced my 78 version. I found out later that Firefox 91 will not run on my iMac as it is not running version 10.12 or higher. My machine is too old to upgrade beyond 10.11.6 I would like to download Firefox 78. Actually I would prefer to reinstall 78 so I could retain my bookmarks. Is this possible? I have tried to find a version 78 to download but keep getting version 91.

I have received several notices telling me that I was running an older version of Firefox and that I should update. I was running Firefox 78 on a 2007 iMac version 10.11.6 I downloaded the newest version of Firefox, 91 and without checking I replaced my 78 version. I found out later that Firefox 91 will not run on my iMac as it is not running version 10.12 or higher. My machine is too old to upgrade beyond 10.11.6 I would like to download Firefox 78. Actually I would prefer to reinstall 78 so I could retain my bookmarks. Is this possible? I have tried to find a version 78 to download but keep getting version 91.

All Replies (2)

more options

Firefox 78.15.0 is the last version for your Mac OS X 10.11 platform (update channel: mozilla-mac-eol-esr1) and you will no longer receive updates, so you are out of luck if you can't update your OS.

Current releases require Mac OS X 10.12 or newer.

more options

Chosen Solution