The readme file contains the following line:WARNINGUSING SOCKS5 PROXIES WITH THIS ADDON WILL CAUSE DNS LEAKS DUE TO HOW FIREFOX HANDLES CNAME LOOKUPS. FOR MORE INFORMATION SEE HERE #7 (comment)There is a simple fix for this. Type about:config in your...
I've found the cause. It's this browser extension that's causing the issue:https://addons.mozilla.org/en-US/firefox/addon/port-authorityhttps://github.com/ACK-J/Port_AuthorityWhen I disable this extension, everything is normal and there are no leaks....
I've also encountered the same problem. When I choose "Use system proxy settings", DNS leakage occurs. However, when I choose "Manual proxy configuration" and fill in the information manually, there won't be any leakage.