[Bug 367531]

[Chalx]

For me, all this patching was just a bad idea from modem era to save
couple of bytes.

When I want to disable internet activity, I click on the network
connection icon in my OS GUI (any Linux or Windows) and use disconnect
option. And I use browser offline mode to avoid ANY browser network
activity with web sites, local proxy, DNS, external/local mail server
(in SeaMonkey and Thunderbird) etc. I just need to view a cached web
page or to stop looped JS refreshes of pages opened.

It was browser offline mode, not system one. And now we have "localhost"
requests depending on browser DNS cache.

Is there any workaround to close all sockets or just to prevent browser
from using them?

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https://bugs.launchpad.net/bugs/367531

Title:
  firefox should be smarter about offline access

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