Adding an atomic file write implementation to NSPR to fix some critical bugs

I would like to have fixed some critical bugs in Mozilla Firefox, like:
https://bugzilla.mozilla.org/show_bug.cgi?id=226970

You can see a strace of buggy code:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=484298#17

but I need to atomically write files as I describe in this article:
http://edpeur.blogspot.com/2007/11/atomic-file-writing.html

I have seen there is no atomic file write implementation in NSPR and
NSPR does not let me do atomic file writing as PR_Rename() will not
overwrite existing files.

Would you accept an atomic file write implementation in NSPR like the one at:
http://library.gnome.org/devel/glib/unstable/glib-File-Utilities.html#g-file-set-contents
? This implementation works in both POSIX and MSWindows.

I have also seen from the strace that PR_fprintf() does not do buffering.
Do not you think that being named closely like fprintf(), that
actually does buffering, is misleading? Or is just that PR_fprintf()
should do buffering and it is just a bug?

Eduardo