[Bug 113201]

[Marcin Wisnicki]

It is indeed horrible!

Today I've tried accessing blender.org whose name servers do not respond.
When using PAC whole browser locks up for ~15s, unfreezes then locks up again.

Switching proxy to manual or direct resolves issue, though browser seems
to freeze for almost second every 10-15 seconds while another tab tries
to load page for ~1min.

This is on Win7 with FF4.0

I guess this can be reproduced by setting up a dns zone with ns records
pointing to dead servers (or finding such domain on internet).

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https://bugs.launchpad.net/bugs/113201

Title:
  firefox spends lots of time hung