As I just discovered, cdn.sstatic.net can get flagged as malicious in a firewall. That effectively "breaks" stackoverflow.com, and I suspect other sites in the network (in my case I only experienced the issue on SO).
Because my background is in programming anyway (like most SOpedians), I had the tools / knowledge to troubleshoot (with help =D) and workaround the issue. What about a different site, like photography.stackexchange.com? This issue could be devestating for a user, possibly to the point that they would leave the site entirely.
I know this is not Stack Exchange's fault, but is there anything we can do to mitigate the issue when it happens?