The Google Voice Progressive Web App (Voice App) is a standalone app that allows you to make and receive Google Voice calls without using a window or tab in your browser, eliminating the awkward workflow of switching between the Voice tab/window and another browser tab/window you're using. 

1. Navigate to https://voice.google.com using the Chrome web browser.
2. In the far right area of the web address/location bar in Chrome, click the Install icon shown below (a small icon depicting a downward-facing arrow in the upper-right corner of a monitor icon).

3. A box will appear asking if you're sure you want to install the App. Click the Install button.

4. After the Voice App is installed, you may want to create a shortcut on your desktop or in your MacOS Dock to make the app easy to open in the future.