WebAssembly

Cookies are the most secure way to do sessions/logins in the browser but this MDN article says Cookies are "old-fashioned", have security problems, and the only reason new websites use them is because of developer habits…

Peer-to-Peer Communications with WebRTC

Comprehensive guide on the JavaScript tooling ecosystem by MDN.

New Tutorial on MDN: Spicy HTML-first JavaScript framework: EmberJS

Firefox (75+) now supports native lazy loading of images

HTTP 402: Payment Required

CSS Containment Specification

HTTP 418: I'm a Teapot

Contributing to the Mozilla Code Base