This is not a Browser problem but a DNS setting for the Website you are trying to View. If this problem occurs to your website try using a snapshot tool to view your site use this link to get An un-cached view of your domain here if you have just changed your domain name to another domain name register. If you did not change your DNS settings you may need to ask your hosting account support service.
I have explained some ways to speed up your website on this blog. But there is one way to make your site really safe and fast at the sametime.
Most internet Service Providers have terrible DNS Servers that are Frequently Attacked so using other DNS servers is not only Faster but Safer Also. Changing the Default DNS Servers on a Motorola Netopia Router is Easy you Just Have to goto the Netopia Router Address in your Browser Normally it is http://192.168.1.254/indexRES.htm and Select Expert Mode.
I just Found this out on How to make the internet Faster By using Google Public DNS all you Have to Do is Change Some Configeration Setting on your Computer or Router just click here to See How to use Google Public DNS and Stop Using your ISP’s Slow Internet Connection