This may have already been posted but I just wanted to bring it up again as I was doing a clean install of XP and ran into the issue. My CPU is one of the older Athlon XP's that does not have the SSE2 extension. Firefox 49 will not support these CPU's. Therefore you will be open to possible security vulnerabilities that are found in future releases of Firefox. Chrome dropped support for these CPU's months ago. The extended support release can still be downloaded that supports these CPUs but support will end in March 2017.
Edited by hamluis, 14 October 2016 - 06:38 PM.
Moved from Gen Chat to Web Browsing/Email - Hamluis.