The following is a window of Firefox (version 57).
The Address Bar contains the URL of the Web Page. The Menu opens on clicking the Menu Button and contains several useful options, which you may explore on your own. There are several other buttons, for you to explore.
The URL of the page in the image is https://www.w3schools.com/bootstrap/bootstrap_images.asp.
The structure of other web browsers, such as Google Chrome, is similar.