Awesome Browser Extensions and Apps

A curated list of awesome resources for building browser extensions and apps

Tools

generator-chrome-extension - yeoman Chrome extension generator that creates everything you need to get started with extension development.
then-chrome - promise-based Chrome extensions API.
chnl - implementation of events compatible with Chrome Extensions Events API.
bro-fs - Promise-based HTML5 Filesystem API allowing to work with sandboxed filesystem in browser.
chrome-manifest - manage manifest, easily include/exclude keys.
WebExtension Manifest Formatter - Format manifest.json in Chrome Extension, Firefox WebExtension and Extension for Edge
WebExtension browser API Polyfill - A lightweight polyfill library for Promise-based WebExtension APIs in Chrome.
web-ext - A command line tool designed to speed up various parts of the extension development process, making development faster and easier.

crx - packs directory into CRX file.
grunt-crx - grunt task used to package Chrome Extensions.
chrome-extension-deploy - programmatic deploy extensions to Chrome Web Store.
download-crx - npm package to dowload CRX from Chrome Web Store by id.
chrome-web-store-item-property - gather version, count of downloads and rating from chrome Web Store.
chrome-store-api - Chrome Webstore API for Node.js.
chrome-webstore-manager - managing Chrome Web Store items from Node.js.
chrome-extension-downloader.com - online service to download CRX from Chrome Web Store.
crxviewer - view Chrome, Opera or Firefox extensions content without installing it.

Official WebExtension Example for Firefox - Example repository containing templates and good practices for creating a WebExtension for Firefox.
webextensions-examples - Example Firefox add-ons created using the WebExtensions API. Maintained by the MDN team at Mozilla.

The Future of Developing Firefox Add-ons - official blog post introducing WebExtensions in Firefox
Setting up Chrome extensions with a free trial period - This blog post will be helpful for those who are looking to set up a free trial period for their Chrome extension hosted in the Chrome web store.

Contribute some ;)

Feel free to share your experience and contribute useful extension resources by creating new issue or pull request. Please read the contribution guidelines first. Thanks!