How to access the DOM tree of the open page in the browser to automate certain actions?

Question

Automation

Good afternoon. Can you tell me how can I access the DOM of an open page in the browser to automate certain actions, such as filling in some fields and clicking "buttons"?. Thank you.

Answer 1

Developer Console and JS.
You can also make a plug-in for the browser.
Or you can generally take Selenium and do everything on it.
In general, I would not even use a browser. After all, the fields go somewhere in the form of a request - you can simply send the same request.