Why would Mozilla add extensions to NPAPI, for more advanced plugins that must be trusted or expensively sandboxed because they are normally compiled? Mozilla is doing everything in the web, adding sound and graphic APIs to html not duplicating them for legacy native code. It doesn't even make sense for Google to do Pepper, let alone Mozilla.
Real threads essentially mean that every call must copy all data or else another thread could modify the data while it is being used by trusted code, or all threads have to be suspended. That's clumsy and not a good solution.
Your statements here are just nonsensical. And given that your account was created the day of this post, and hasn't commented on anything else, it's hard not to read this as simple trolling.
Real threads essentially mean that every call must copy all data or else another thread could modify the data while it is being used by trusted code, or all threads have to be suspended. That's clumsy and not a good solution.