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Is there a way to add an exception and unblock all intranet sites?

The easiest way I can think of is checking for a period in the hostname. Any help would be greatly appreciated.
@@|http://hostname/*

Try regular expression filter. @@/^https?:\/\/\w+(\/|$)/ will match URLs like http://host_123, https://secure_host_007/favicon.ico and such. Heavy backslashing, heh? You may also insert something like (:\d+)? after \w+ to allow connection to non-default (80 for HTTP, 443 for HTTPS) port number.

This worked for me:

@@/^https?:\/\/\w+(:\d+)?(\/|$)/$document