Orange button "Firefox"

Hello everyone, I really like the classic Firefox interface, but I want to move the orange button the Firefox, in that there would not be an empty space after moving the button and the first tab was near the left edge of the screen, can any one of you write a very small extension, what would happen like this:

:pray:

Try installing the addon Classic Theme Restorer
https://addons.mozilla.org/it/firefox/addon/classicthemerestorer/?src=userprofile