Block Requests to specific domain?

[Gerry Hickman via support-seamonkey]

Is it possible to prevent SeaMonkey making requests to a certain domain? 
I know you can "block images" from a certain domain, but can you tell SM 
to never make any kind of request to that domain?

e.g. a domain called ads.com, with servers, x.ads.com, y.ads.com
can you block any request to *.ads.com?

--
Gerry Hickman (London UK)
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