Firefox does not have a built-in calendar. You can use an online one such as Google Calendar - www.google.com/calendar
The calendar created by Mozilla is an add-on called Lightning which is for use with the email program Thunderbird.
Firefox does not have a built-in calendar. You can use an online one such as Google Calendar - www.google.com/calendar
The calendar created by Mozilla is an add-on called [https://addons.mozilla.org/en-US/thunderbird/addon/2313/ Lightning] which is for use with the email program [http://www.mozillamessaging.com/en-US/thunderbird/ Thunderbird].
