Version 0.3 - add JPG photo export
N.B.:
This webapp backups all your existing contacts on your SD-card, into the path contacts2xml. It has been tested with hundreds of contacts, but is still under development.
Unplug any USB wire before doing a backup or you won't be able to write on the sd-card !
For more security, don't forget to copy all backup files outside of your phone, using the USB capabilities of Firefox OS.
To restore your contacts, use the XML2Contacts webapp.