The requested URL /ap_index was not found on this server. How do I have firefox allow this website?
First try clearing your cookies.
Go to ->Options ->Options ->Privacy ->"Clear your recent history" ->Select "Everything" from the time range. ->then "Clear Now"
If that doesn't work, try this.
->Options ->Options ->Advanced ->"Network" tab ->Under "Connection" hit the "Settings" button. ->select "No proxy" and hit "OK" ->Restart Firefox
Hope that helps.
Try clearing the cache as well.
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
"Remove Cookies" from sites causing problems: