Firefox will likely remain supported on XP for even longer than Chrome. Firefox was still supporting Windows 2000 when Chrome was originally launched... at which time Chrome only ran on Windows XP or better. At the time of Chrome's launch, Windows 2000 was still within its support lifecycle and would be for another 2 years.
Firefox 12, released just last year, was the last version to support Windows 2000 despite the fact that Windows 2000 was end of lifed in 2010. If they stick to the same old OS support timeframe, Firefox would support Windows XP through 2015.
Firefox 12, released just last year, was the last version to support Windows 2000 despite the fact that Windows 2000 was end of lifed in 2010. If they stick to the same old OS support timeframe, Firefox would support Windows XP through 2015.