But Microsoft still offers “custom support relationships” for organizations.Organizations must contact “their account team or their local Microsoft representative for more information.” The wording here makes it clear that these support contracts aren’t for typical users or even small businesses. More than 27% of computers on the Internet still run Windows XP.Windows XP is now out of the “extended support” phase where Microsoft creates security updates for Windows XP and distributes them to all users via Windows Update.Microsoft won’t release any more security updates to most Windows XP users.
Despite the end of Windows XP support, it is estimated that 27.7 per cent of the world's computers still use it.
Unsupported operating systems receive no security updates, have known exploits, and can be dangerous to use, which makes it difficult to maintain Firefox on those versions.
Firefox security updates for XP and Vista users will continue until September 2017, although new features will not be offered.
In March 2017, if you are using Firefox with Windows XP or Windows Vista, you will automatically be updated to the Extended Support Release version of Firefox.
You will continue to receive important Firefox security updates but no other features or updates. If you want to keep your Firefox up to date, with all the latest features and updates, you'll need to upgrade your computer's operating system.