How to implement variable passing between Chrome tabs?

Question

JavaScript

Hello.

I make a command in the developer console
var a = document.querySelector('aaa').ounerText;
In the variable a there is a result.

I open a new tab in the browser
and now how to insert the value of this variable into my field?

....textarea = document.querySelector('aaa').InnetText(a);

But there is no value in a (((

Thank you