- Add jscookie.h
- Move JSCF_ function to mocha thread for thread safety.
- Add functions to libevent.h to deal with multiple window groups.
- Add functions to libmocha.h to deal with multiple window groups.
private NSPR headers (prosdep.h and primpl.h) from the Mozilla source.
The part of prosdep.h that is actually needed by Mozilla was extracted
and put in the new file mozilla/include/xp_path.h.