Firefox/Chrome won't load a certain site.

Hello, hi, I've been having this problem for...about three days today. Firefox and Chrome will not load tumblr from like 8pm to midnight. It's been doing it since Monday and I seem to be the only one having the problem. Even my facebook games go out once I know tumblr doesn't work. I can get on them once in a while for like a minute or more if I'm lucky but then it goes back to Problem loading page and Oops Chrome could not fine, and so on. I don't know what to do. All other websites work fine. I've tried clearing my cookies but nothing. Any suggestions?