b) Would it be possible to add some kind of interface for my wife to ADD item to my shopping list via a message from SMS/E-mail/Bluetooth (any of these)?
b) from Firefox OS, you can already send a list via e-mail (SMS used to work too, but seems the API has changed), just touch the share icon at the bottom of a list. But if I understood correctly, you want someone to remotely add things to the list on your phone? I'm afraid this kind of feature requires an authentication model FoxShop doesn't have at the moment. But of course, feel free to contribute!
Of course, the authentication is a problem given the very limited amount of data we can transfer with SMS. Couldn’t we just allow adding an item from specified addresses (phone numbers)? It is not a great authentication, but my shopping list is not the super private secret (if you keep list of orders for your heroin dealership business, I am sorry for you).
c) it works on Firefox for Android, but the share API is missing, so basically everything works except the sharing feature. I had a workaround in mind (using AJAX CORS requests to my own server to send e-mail, but never had the time to implement it.)
Of course, the authentication is a problem given the very limited amount of data we can transfer with SMS. Couldn’t we just allow adding an item from specified addresses (phone numbers)? It is not a great authentication, but my shopping list is not the super private secret (if you keep list of orders for your heroin dealership business, I am sorry for you).
Perhaps the situation with WebActivities is not that hopeless https://bugzilla.mozilla.org/show_bug.cgi?id=776027