ESR version has been designed for organizations, but individual users may use it as well. And all XP and Vista users have already received an update to this channel.

Hi TyDraniu,

Thanks ! Your answer was partly helpful, confirming that users already have automatically received an update to the ESR version, as promised in the original "Important - [...]" - warning (see my earlier quote).

I was not aware having received the update; I did not see any notification to that effect. Where can I check if I indeed have been updated ? Is it visible somewhere?

Further, I still should like to have a 'status report' concerning the 'final support end date' ( "In mid-2017, a final support end date will be announced"). So far, I did not see any further notification.

Does anyone know more?

Note that this last date would be mid-2018 when Firefox ESR switches from 52 ESR to 59 ESR.

bart123 said

Hi TyDraniu, I was not aware having received the update; I did not see any notification to that effect. Where can I check if I indeed have been updated ? Is it visible somewhere?

Yes, it is visible under Help -> About Firefox. You should have a note: Now you're using this update channel: esr. Otherwise you can press Check for updates button.