This bug does not affect Tor Browser 4.0.1 I use my own privoxy proxy settings and tor instance to browse the web. Tor button -> preferences shows my settings as: HTTP Proxy: 127.0.0.1 Port: 8118 SSL Proxy: 127.0.0.1 Port: 8118 SOCKS Host: 127.0.0.1 Port 9050 With those settings I get the error Problem loading page Unable to find the proxy server Firefox is configured to use a proxy server that can't be found. I can only browse if i remove the HTTP and SSL proxy settings and leave the SOCKS host settings on. My configuration is correct and it works with tor browser 4.0.1 and versions before that. **Trac**: **Username**: cypherpunks-duplicate