Make sure you access the admin with exactly the same url as set in WordPress and that it's the right one. NS_ERROR_DOM_BAD_DOCUMENT_DOMAIN means that TinyMCE is trying to access some of its files probably from a sub-domain and it takes the path from the setting in WordPress.
If all this is OK, check your .htaccess file for possible improper redirects. Also look if there are more than one .htaccess in different sub-directories and check them all.