[Bug 113201]

[Slamb+bugzilla]

Indeed, isInNet couldn't possibly work except by a DNS resolution. But
the advice is good; best to avoid that call whenever possible.

Other workarounds: local proxy server: I wrote
http://www.slamb.org/projects/foxigniter/ for this purpose back in 2008,
reasoning that it was a lot easier to write than to get a patch into
Firefox. (Given that the bug is around three years later, it appears I
was right.) But I never finished it, so it has several problems
including a crash when the local side of the proxy cancels a request and
a lack of flow control without some libevent patches that probably won't
apply cleanly to a modern version.

The reason I never finished it? Switched to Google Chrome instead. Maybe
it's a bit rude of me to point this out on the Firefox bug tracker, but
Chrome doesn't have this problem, so I'm much happier.

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

Title:
  firefox spends lots of time hung

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