You will need an understanding of vanilla Javascript
The aim of this article is to give you an overview and understanding of the basic components of a Chrome Extension.
Please note: this article is written for Manifest v2 which is deprecated. If you wish to publish an extension to the Chrome store you will need to use Manifest v3. How to migrate from Manifest v2 to v3
Chromium browsers are web browsers that are built on top of the open-source Chromium engine. These browsers include Chrome, Brave and Edge.
A Chromium Extension is a web extension built for and that is capable of running on a Chromium browser. This means you can build an extension that not only works for Chrome; which as of May 2022, has a 64.91 global market share; but also for any browsers that run on it's engine.