How to change javascript on the fly in browser?

Question

JavaScript

As I understand it, there are two options for changing the js code in the browser:
1) Js is written in the body of the page inside the tags <script></script>and you can change it in the "Elements" tab.
2) Js is included as a separate file, and its contents can be changed in the "Sources" tab.
So: change is changing, but I still don’t understand how to make the changes take effect or the page reloads with the changed code.
Tell me please.

Answer 1

For example, an extension in Chrome -> TamperMonkey