Comment 54 for bug 113201

>Can I bypass the problem by using a local DNS server on my PC??

No, it blocks trying to find the DNS, and its the remote DNS server, authority for the zone/domain that you want that is taking longer to respond.
The local dns would cache more queries and so may solve later queries to the same zone/domain, but you will get this on the firsts DNS resquests for each new zone/domain

>Can I bypass the problem by using a local proxy (es. Privoxy) on my PC??

if you are using the IsInNet, no... the browser is waiting for the result of the DNS do know what the result of IsInNet, to know what proxy will use (even if in the end you will only use one)

the only workaround that i found is to remove the IsInNet and test for other things, like checking for isPlainHostName, checking the local domains, then check if the regexp of the url have my ip address range
all this tests are fast and dont use the DNS... this works but its a pain and might not even be possible for some requirements

the but here is the freeze of ALL browser, instead of just the page that is waiting for the DNS

ps: the OS should be set to ALL