Here is a bug report about this issue in firefox 10 http://www.reactos.org/bugzilla/show_bug.cgi?id=6910 See comment 5 where a developer reports that "Bug has been introduced by revision 55576" http://code.google.com/p/reactos-mirror/source/detail?r=55576 However, I don't see in which way ...

I suggest creating a POSIX subsistem. This way, you will have a lot of free software available for React OS (in particular, many utilities from the GNU project).

I think that Windows NT has a POSIX subsistem.