I built this tool because I had a lot of production issues where I needed to make some changes and test them. I couldn't use devtools' Elements or Sources panel since I had to make this changes available as the page loads (inline script changes, css url changes, etc...).<p>I tried using Fiddler and similar alternatives (Charles, Burp), but:<p>1. when running it on the Mac you need to run a VM<p>2. Fiddler shows you ALL the requests made by you're machine.<p>3. Moving between Fiddler, Chrome and Sublime is just annoying.<p>Since it's running a proxy server (it's actually based on <a href="http://www.mitmproxy.org" rel="nofollow">http://www.mitmproxy.org</a>) on your machine, it's also very useful when you want to test things on mobile devices.