Proxychains won't work with NordVPN socks5 proxy

I've been trying to get to use NordVPN socks5 from their servers. My proxychains.conf looks like this:

# proxychains.conf  VER 3.1##        HTTP, SOCKS4, SOCKS5 tunneling proxifier with DNS.#   # The option below identifies how the ProxyList is treated.# only one option should be uncommented at time,# otherwise the last appearing option will be accepted##dynamic_chain## Dynamic - Each connection will be done via chained proxies# all proxies chained in the order as they appear in the list# at least one proxy must be online to play in chain# (dead proxies are skipped)# otherwise EINTR is returned to the app#strict_chain## Strict - Each connection will be done via chained proxies# all proxies chained in the order as they appear in the list# all proxies must be online to play in chain# otherwise EINTR is returned to the app##random_chain## Random - Each connection will be done via random proxy# (or proxy chain, see  chain_len) from the list.# this option is good to test your IDS :)# Make sense only if random_chain#chain_len = 2# Quiet mode (no output from library)#quiet_mode# Proxy DNS requests - no leak for DNS dataproxy_dns # Some timeouts in millisecondstcp_read_time_out 15000tcp_connect_time_out 8000# ProxyList format#       type  host  port [user pass]#       (values separated by 'tab' or 'blank')###        Examples:##               socks5  192.168.67.78   1080    lamer   secret#               http    192.168.89.3    8080    justu   hidden#               socks4  192.168.1.49    1080#               http    192.168.39.93   8080###       proxy types: http, socks4, socks5#        ( auth types supported: "basic"-http  "user/pass"-socks )#[ProxyList]# add proxy here ...# meanwile# defaults set to "tor"#socks4     127.0.0.1 9050socks5  us100.nordvpn.com.tcp443.ovpn 1080 username password

Using proxychains firefox, I launch Firefox,but it won't load anything. How can I get proxychains to work in Firefox with the NordVPN proxy?