You can customize the toolbar by adding or removing buttons, changing the size of icons, and showing or hiding the text on labels.
Just right-click the toolbar, and then click Customize.
If you have low vision, you might want to add the Size button for quick access to the relative font size.
If you are using a screen reader, you might want to select Small Icons in the Icon Options list, and No text labels in the Text Options list to maximize the amount of screen space available for Web content.