Currently we keep sites on the preload list that are already on our list even if we can't connect to them (on the grounds that we shouldn't drop a site if there's a temporary network disruption). However, when the script makes the nsSTSPreloadList.errors file, the output makes it look like those sites are not on the list. We should add a note like "(but we kept it because it was on the list previously)". https://twitter.com/unhush/status/413023924138426368
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