Oh btw, it also applies to my Internet Explorer, not just Firefox. I have never heard of a problem like mine before, or anything remotely close to it.

edit: and it just happened to MSN Messenger, so I guess it's not just for my browsers but instead something is wrong with my connection. That's pretty weird because I didn't even touch my connection settings recently. Maybe I'm due for a simple modem/router reset...?

edit 2: Nope, not modem or router problem. This is certainly weird. Resetted both and still same problem.