How to make the firefox browser display the width and height in pixels when the window is resized?

Question

Browsers

Greetings, please tell me how in the firefox browser to display the width and height in pixels when the window is resized? Google Chrome has it, but unfortunately I don’t see it in FireFox ..
Here is an example of what I want to see:

Answer 1

Open developer tools. Everything is there. And even more.