There are 2 repositories under extension-development topic.
A Chrome Extension to inject JavaScript and CSS into any website, By that extension, you can inject your custom JavaScript or CSS codes to a single website or multiple websites...
Cookiecutter template for generating Visual Studio Code extensions
Execute snippets of JavaScript in the Nova extension runtime
Site Blocker Chrome Extension, By that extension, You Can Control The User's Access To Any Website With Blacklist Or Whitelist and Block Or Allow User Access On the Client-Side Using Vanilla JavaScript then display the access denied error You can block any Domain or IP you want.
VS Code Extension Dev Tools
Automation for creating deployment files.