Mozilla.org is a good target to evaluate client diversity because it receives traffic from all sorts of devices from all over the world.

A simple yet powerful REST API Client with cookie management, environment variables, code generation, and authentication. Not open source but currently free.

A set of tools to analyze your website and inform you if you’re using some of the many available methods to secure it. Code here.

Learn from Google and Flipboard alum Jed Borovik how callbacks interact with the event loop, implement your own generator-based control flow library, and see how to use ES7 async functions. Use "weekly2016" for 30% off

The first in a series looking at tools and techniques to optimize your website for load speed.

“I fear that HTTP Public Key Pinning — a standard that was intended to bring public key pinning to the masses—might be dead.”

Uses the client-side Navigation Timing API and a script to send results to your Slack channel of choice.

A ‘swiss army knife’ for testing web apps. Install GoReplay, ‘record’ your app’s traffic, then replay it later when testing/debugging.

Under certain circumstances, Chrome is blocking some external scripts that are using document.write() to improve performance.