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A: No awnsers as of yet
=== [http://groups.google.com/group/mozilla.dev.tech.js-engine/browse_frm/thread/c59a6b91bd072c1e Newly created threads in JS from MOZILLA_1_8_BRANCH causes to hang in Windows] ===
This [https://bugzilla.mozilla.org/show_bug.cgi?id=351602 Patch] should fix the problem.
After that, recompile JS and define JS_USE_ONLY_NSPR_LOCKS in the build.
