I was playing with Pokemon Diamond using No$GBA. We have a router at home. When i tried to open firefox, it did not connect. When i tried to close No$Gba, the internet connection is restored. Why is that?
It's not that your connection is down, but that No$ drains so much prosessing power that any other application (including FireFox) takes ages to load. That puts it over the preset timeframe before the page loads, so the browser displays a "Connection down" message. You should be able to connect if you just minimize No$, though.