Hacker News on 25 September 2015

• Dropbox has open-sourced Zulip
• From Radio to Porn, British Spies Track Web Users’ Online Identities
• How Chromium Works
• Forcing suspects to reveal phone passwords is unconstitutional, court says
• Thanks HN: Glowforge will open-source its firmware
• Elixir v1.1.0 Released
• Hard, Not Soft, Kill Switches
• I Have Read Prop F
• Urbit: an operating function
• Rejuvenating the Microsoft C/C++ Compiler