If Rhythmbox "Notification" plugin is enabled (which is the default), notifications get duplicated (well, one is from Rhythmbox and the other from the extension).
You can manually disable the Rhythmbox notification plugin and just get the ones from the extension.
If Rhythmbox "Notification" plugin is enabled (which is the default), notifications get duplicated (well, one is from Rhythmbox and the other from the extension).
You can manually disable the Rhythmbox notification plugin and just get the ones from the extension.