Unable to connect
Firefox can’t establish a connection to the server at http://www.google.com.
The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer’s network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.
My wife's Windows box using Chrome isn't having this problem, so it's likely something my Mac or Firefox is doing.
Or not doing. Both computers connect with Ethernet to the Sonic router, fiber.