[Yosemitest]

I just downloaded FireFox on Mac, installed it and tried to go to Dogpile.
This is what I got.

"The connection was reset

The connection to the server was reset while the page was loading.
The site could be temporarily unavailable or too busy.

• Try again in a few moments.
  
  
• If you are unable to load any pages, check your computer's network connection.
  
  
• If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web."
  

FireFox come up on the web fine.

[BitWielder1]

If you're at home, call your ISP, if you're at work, they may have a firewall.