Rated 4 out of 5 stars

pro:
- The addon can do timed exports of the calendar. I use it to create a web view of the calendar with phpicalendar.
con:
- Version of the addon here on addons.mozilla.org is outdated (0.3.2) . On the author homepage is a never version. (0.4.3)
- Automatic export "on close" is not working. But I don't need it. I used timed exports every 10 minutes.

This review is for a previous version of the add-on (0.3.2).