User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:2.0b5) Gecko/20100101 Firefox/4.0b5 Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b5) Gecko/20100101 Firefox/4.0b5 FF4b5 does not get pages via an https connection when going via an authenticated proxy (NTLM). Via un-authenticated proxies works okay. As do internal https sites that bypass the proxy. Tried with and without all plugins loaded. Confirmed proxy connections via an alternate browser. Reproducible: Always Steps to Reproduce: 1. Connect to https site with NTLM proxy defined. Actual Results: browser status remains on "Done". No apparent attempt to load the page. Expected Results: https sites should work - the http version of each site works at whilst the https doesn't e.g. http://www.paypal.com/ fails, but http://www.paypal.com/ works in different tabs. Likewise for Google, etc.