Just because Windows Vista is being released today does not mean Mozilla is going to stop supporting Windows XP after the upcoming Firefox 3 release later this year. The only reason Mozilla ended support for Windows 95/98/Me with the upcoming Firefox 3 release was because Microsoft discontinued support for these obsolete operating systems. Mozilla’s plans are as long as Microsoft continues to support Windows XP, they will continue to support XP with future Firefox releases. So now million dollar question: When does Microsoft plan to discontinue Windows XP support? The answer depends on if you were using XP Home or…