Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
after you add a line in the .htaccess
redirect 301 / http://www.you.com/your wordpress site folder/
I found it was due to a
Canonical issues: www vs. non-www
remove the lines
redirect 301 / http://www.you.com/your wordpress site folder/
and add
Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} ^yoursite.com [NC]
RewriteRule ^(.*)$ http://www.yoursite.com/your wordpress wpmu folder name$1 [L,R=301]