Tandem app-sharing is enabled for Windows users, but Mac users will need to add a Firefox Extension to add this feature:

  1. Install this Firefox extension: https://addons.mozilla.org/en-US/firefox/addon/add-url-to-window-title/

  2. After you install it, select "tools" and "Add-ons and themes" from the Firebox menu

  3. Click on the extension, click on "preferences" and check the “Show the full URL” box

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