Add setting to hide SMS content only

Hi,

A feature I really miss is the capability to be aware that a new SMS has arrived, but without displaying a
notification by the browser (for privacy purpose). Currently :

• either you enable notifications for one's SMS app, and SMS are displayed on PC screen
  (contents can be hidden, but it applies to any other, non-SMS, notification, which is annoying),
• or disable notification for one's SMS app, but then one's has to check regularly phone or open the
  extension to verify if a new SMS has arrived.

What would be nice is something like this:

• a supplemental setting in the extension allowing to hide SMS notifications *only*, thus not
  impacting other notifications (the other existing setting can be used for all if needed)
• but when a new SMS arrived, the badge on the notification button is set to tell the user that a new
  SMS can be read, despite the fact it was not displayed in a notification on the PC.

Hope this is clear enough ;-) Let me know otherwise