nsNullPrincipal::CheckMayLoad uses nsScriptSecurityManager in a thread-unsafe way (since it uses string bundles). I guess we want nsNullPrincipal to be threadsafe, so we need to fix this somehow.
> I guess we want nsNullPrincipal to be threadsafe We do? Why? What operations on it do we want to be threadsafe? In general, principals and the security manager are not threadsafe last I checked....
See bug 626301, shaver wants us to use nsNullPrincipal for Workers.
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