Just to avoid potential confusion
Just to avoid potential confusion, there is a Google Chrome OS and a Firefox OS, but both of them are largely targeted at very specific markets. Chrome OS is aimed at its Chromebook line, which are ultra-low end netbooks, and Firefox OS is an alternative to Android, iOS, etc that is still in very early development.
It's possible that the OP or someone else reading this may be confused by coming across either of these options in a search, so figured I'd mention it.
Other than that, I agree that the general issue is less with the web browser and more with the OS no longer being supported. If someone finds an exploit in XP, not just IE, that will no longer be patched by Microsoft. Switching to Firefox or Chrome from Internet Explorer would be a good short-term solution, but I would not rely on this for more than around six months after the final set of updates for XP have been pushed out. Honestly, the sooner you move to an actively supported OS the better, be it a more recent version of Windows or even something like Linux if your computer is not up to the task of running Vista (or later) well and buying a new computer is not financially feasible for the foreseeable future.
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