Once the Tabzilla plugin is installed, you will see new right-click menu options for each open tab in the Notes client:

The new options are:

By default, these actions will not close the Home, Discover, Workspace, or Mail tabs if they are open. You can change this behavior on the preferences page, found in the Notes Preferences dialog:

The first preference group allows to you select which "special" tabs will be closed by the menu actions. Anything checked can be closed by the actions; anything unchecked will not be closed by the actions.

The second preference group allows you to disable some or all of the new menu actions in the right-click menu for open tabs.