Today I tried using a Socks5 proxy that requires user and password. It seems that this is still unsupported as already concluded in https://support.mozilla.org/en-US/questions/1237174 and https://bugzilla.mozilla.org/show_bug.cgi?id=122752 Any news on this? Kind regards, aanno PS: I _was_ able to use the very same proxy with curl with curl --proxy-user user1:pass1 --socks5 "http://localhost:1080" https://www.google.de