Because of weaknesses in the SHA-1 algorithm and to align to industry standards, we have changed the signing of Windows updates to use the more secure SHA-2 algorithm exclusively. The signatures are used to authenticate that the updates come directly from Microsoft and were not tampered with during delivery.

Over two years after Chromium, Chrome, Opera dropped WinXP/Vista support back in April 2016.To help protect the security of the Windows operating system, updates were previously signed (using both the SHA-1 and SHA-2 hash algorithms). Microsoft stopped WinXP extended support on Apr 8, 2014, yet Mozilla supported the EOL WinXP (and Vista) til Fx 52.9.0esr released June 26, 2018. If anything Mozilla may stop supporting 32-bit Firefox for Windows before Firefox is not able to run on 7, 8 and 8.1. Win8.1 extended support ends Jan 10, 2023

Unless there is something OS dependent there is no reason for Firefox web browser to stop supporting Windows 7, 8 and 8.1 anytime soon. įirefox Releases works fine on Windows 7 now so why would it not after ?

Technically extended support for Windows 7 ended as it is only the pay for Extended Security Updates that will go as late as Jan 10, 2023. Further to the issue of FF no longer supporting Win 7 – I posted a question in the Mozilla forums and got this answer from one of the moderators:

Update kb4474419