In addition, all your tasks are backed up locally once per session. The last 10 backups are stored and can be accessed with a simple viewer located in the add-on's options.
This add-on is designed to complement Lightning (which can sync events with Google Calendar, but not tasks). However, it does not require Lightning to function. If Lightning is installed, Google Tasks Sync's interface can attach to the Today Pane.
This add-on reuses code from the following projects - all under GPLv3 or compatible licenses:
oauth.js by Netflix, Inc.
oauthorizer by Shane Caraveo
goo.gl lite by Matthew Flaschen
jsio.js by MonkeeSage
Thanks to Tyler Freeman for contributing a code patch.
Some Public Domain images from openclipart.org were used to create Google Tasks Sync's UI and icon.