Quick Zoom allows you to zoom into the page using your mouse wheel and holding down the Cmd key. Similar to the Ctrl + mouse wheel on Windows, Quick Zoom brings this functionality to macOS. Usage: macOS Hold down your Cmd key and scroll with your mouse to zoom in and out of the page. Windows Hold down the Windows key and scroll with your mouse to zoom in and out of the page. The browser also allows you to zoom by holding Ctrl and scrolling with your mouse wheel without this extension.