Hi Robert, I don't know that anyone will want to click a link to a random Gmail message, or if anyone but you will have permission to view it.

But there was a message sent out recently about Firefox 78 ESR.

As I understand it, something is changing on the back end related to how you sign in to your Firefox/Mozilla Account. The method used in Firefox 78 ESR and earlier is being discontinued. That will prevent Firefox 78 ESR from connecting.

This is a big problem if you use Sync, and possibly or other services linked to your account. What services? For reference, see: Access Mozilla services with a Mozilla account.

Unfortunately, updating Firefox without a system update isn't a solution for you because you already have the latest version of Firefox available for your version of MacOS (Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release).

If Sync or other services are important to you, you may need to consider a MacOS update or new computer.

Thank you so much for your comments. This should be helpful. Anyone else care to comment on this issue?

Thanks again.

Robert Kelly

[removed email from public support forum]

Firefox 116.0 and later requires macOS 10.15 (ten.fifteen) at minimum to run while Firefox 79.0 to 115.0 required macOS 10.12, 10.13, 10.14 to run. Firefox 115 ESR has been an option for macOS 10.12, 10.13, 10.14 users as the last update for it will be 115.15.0esr in Sept 2024.