If you tried (like me) to redirect your / (root) web directory to a subfolder (like /wp/) modifying .htaccess in this way:
You probably found that it didn’t work. The browser will end up in an endless loop of redirections. Firefox will complain with this error message:
The page isn't redirecting properly
Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
This problem can sometimes be caused by disabling or refusing to accept cookies.
The right way to accomplish the root to subfolder redirection is the following:
Hope it helps