Universal standard for creating browser extensions.
Working through a W3C charter group, Mozilla has partnered with Microsoft and Opera to define a browser extension API that works across multiple browsers.
There is currently a preliminary specification that matches what Google has implemented in Chrome so that extensions written to the specification could potentially work on Chrome, Edge, Opera and Firefox.
Firefox add-on for arranging tabs vertically
A WebExtension which improves Twitter & TweetDeck user experience for Persian users
Dark mode for Google Classroom based on Material Design.
WebExtension that hides the "Hot Network Questions" sidebar on StackOverflow and related sites
Created by Browser Extension Community Group
Released May 7, 2015