I can not access duck duck go from the firefox web browser version 133.0.3 either by typing it as an address in the bar nor by using it as the default search engine in settings. Google and you tube are blocked on our network by a firewall. Duck Duck go used to work, but at some point stopped. This is on mulptiple PC's and Chromebooks. I see the following sites show up on the firewall's blocked list when I startup Firefox Desktop: (See Attached photo) When I type in www.duckduckgo.com on the address bar I get a "server not found" error. If I search for any search query in the address bar with duck duck go set as the default search engine, I get a server not found error. I can use an apple phone device with safari browser and cell data turned off to access duck duck go's website and complete searches while connected to our network. I can browse yahoo.com and complete searches with no problem.