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Re:What's new in Firefox 3.5 by gjm11 on Friday May 01, 2009 @11:18AM (#588589)
Hmmm. Brendan Eich in 2007:

http://weblogs.mozillazine.org/roadmap/archives/2007/02/thre...

'''So my default answer to questions such as the one I got at last May's Ajax Experience, "When will you add threads to JavaScript?" is: "over your dead body!"'''

Re:What's new in Firefox 3.5 by mbrubeck on Friday May 01, 2009 @11:25AM (#588598)
From his comments on the same post:

"I think message passing shared nothing beats shared memory preemptively scheduled threads."

So Web Workers are an implementation of his preferred solution.