Comment 8 for bug 113201

This bug shouldn't just be considered a straight duplicate of bug 174733. It is
true that both bugs stem from the same problem: very poor single-threaded DNS
design, locking up the entire browser during a DNS query. As others have
pointed out, this is hopefully being rewritten for 1.6.

I believe that this bug should remain open to address the PAC issue. If this
issue magically goes away when DNS is fixed in 1.6, that will be great, but this
bug should stay open until then.