How I built a browser extension in 2021 (using modern tools and libraries)

Recently, I started working on my first browser extension for Firefox and Chrome. With this blog post I want to share my experience building a web extension with modern tools and frameworks in 2021. Therefore, this is not a guide on how to build a browser extension, but rather contains some useful information and tips I gathered while developing the extension. goto: The scope of my extension What’s up with this manifest.