Hi

I am not aware of any change expected for Firefox in the near future. The current requirements are listed here.

I hope this helps, but if not, please come back here and we can look into a different solution for you.

Firefox still supports Windows XP SP2 and Windows Server 2003 SP1 [both of which are much older than Vista], so I doubt if Vista support will end any time soon.

Only issue with the WinXP, 2003 and Vista is the sha-2.

WinXP SP2 cannot install Firefox 43.0.2/43.0.3 as they need to install 43.0.1 and then update. The 2003 is same. The Windows Vista and 2008 users need to make sure they have a update for SP2. https://support.microsoft.com/en-us/kb/2763674