Welcome to Firefox Add-ons.
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Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
Also, NaN should now not appear for anyone. The method by which calendars are added is now much more streamlined and doesn't require you to set your calendars to public.
The addition of new events has been streamlined allowing you to add all information to an event on one quick pop up. There are now two menus to access the add ons features, one in the sidebar in the form of buttons and a context menu for the icons.