Just a heads-up.
I sometimes get this warning on clicking a DC forum link in Google's search results using Firefox.
when this happened today.
If this isn't isolated and happens to others it might be pretty off-putting to someone who hasn't heard of the site.
I've chosen to "add an exception" on prior occasions but I noticed today that the exception url that pops up is very thread+message specific, so it doesn't really help in the future.