Is it possible to create an extension so that it would take information from another site?

Question

JavaScript

Let's say there is an extension icon in the upper right corner! We currently have Yandex open ! And if you click on this icon, the search text field will be filled with the text "Test123"! Is this possible and how?

Answer 1

maybe I don’t know exactly how in detail, but it’s possible to manage styles, parse, delete html code, etc., it’s also possible to apply your own styles, js code can also be connected,
I think the solution development process is described somewhere in sufficient detail and it’s not a problem to find, but an idea It's simple that you write code that is connected by an extension under the right conditions.