version=3
http://downloads.mozdev.org/gcontactsync/gContactSync-(\d+.\d+.\d+)\.xpi
https://addons.mozilla.org/thunderbird/addon/gcontactsync/ \
https://addons.mozilla.org/thunderbird/downloads/file/\d+/gcontactsync-([\d\.\w]+)-.*\.xpi\?src=dp-btn-version
