Flaw in Firefox 3.0: protocol-handler.warn-external are ignored

["carl hardwick" <hardwick.carl () gmail com>]

these protocol-handler security settings are ignored although they're
set to 'true' and no warnings are shown:

network.protocol-handler.warn-external.mailto
network.protocol-handler.warn-external.news
network.protocol-handler.warn-external.nntp
network.protocol-handler.warn-external.snews
(in about:config)

For example,
I set network.protocol-handler.warn-external.mailto to 'true', clicked
on an e-mail link and Windows Mail is launched without any warnings
(tested on Firefox 3.0 on Windows Vista SP1)

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