Inspect Firefox and Chrome extensions with https://tim-we.github.io/web-ext-inspector
What is Extension Inspector?
Extension Inspector is a Firefox add-on that allows you to inspect the source code and assets of browser extensions for Firefox and Chrome/Chromium-based browsers. With Extension Inspector, you can easily analyze and understand the inner workings of these extensions.
Inspect the source code and assets of browser extensions for Firefox and Chrome/Chromium-based browsers.
Extension Inspector is safe to use. It does not request any sensitive permissions.
Extension Inspector has earned a fairly good reputation and likely can be trusted.