The Mozilla Calendar project also known as Lightning (more info).

Select a component to see open bugs in that component:


For issues with alarms for scheduled events and tasks.

Build Config

For issues regarding Build Config.

Calendar Views

For issues concerning the grid views: month, week, multiweek, and day. Issues concerning display, drag/drop, searching, and inline editing of events/tasks


For issues with the calendar, event, and task dialogs.

E-mail based Scheduling (iTIP/iMIP)

For issues with E-mail based scheduling, e.g. accepting invitations or sending out invitations, replies etc.


For issues which don't fit in a more specific Calendar component.

ICAL.js Integration

Bugs within the integration layer for the ICAL.js library from . For issues with the library itself (i.e in calendar/base/modules/ical.js), please file an issue on github. This component is about the wrapper interface between xpcom and ICAL.js

Import and Export

For issues with format conversions (for importing, exporting, emailing, cutting, pasting, dragging, and dropping to/from another application).

Internal Components

For issues with the internal interfaces of the calendar components. Bug example: Incorrect timezone calculations.

Lightning Only

For issues that only affect the Lightning product. For example: Lightning menus, toolbars, Thunderbird integration, preferences etc. Note that localization issues should be reported to the Mozilla Localization project.

Lightning: SeaMonkey Integration

For issues that only affect the Lightning product on SeaMonkey. For example: SeaMonkey integration, preferences, etc.

OS Integration

Areas where Calendar integrates with the host desktop environment. Please use the relevant UI component for any Theme-related issues. Please use the "Core" product for other OS integration problems.


Issues related to calendar preferences.


For issues with printing.

Provider: CalDAV

For issues with CalDAV server communication

Provider: GData

For issues regarding the 'Provider for Google Calendar' extension

Provider: ICS/WebDAV

For issues regarding communicating with .ics files via remote (http:) and local (file:) URIs.

Provider: Local Storage

For issues regarding local calendar storage, based on mozStorage (SQLite).

Provider: WCAP

For issues with WCAP


For app-level security bugs.

If the problem relates to underlying components (PSM, NSS, Core, Toolkit) then please file it in the appropriate product instead of here.

Sunbird Only

For issues that only affect the Sunbird product. For example: toolbars, menu items, sunbird specific preferences, etc. Note that localization issues should be reported to the Mozilla Localization project.


For issues with Task lists, display, editing, and searching. (If it applies only to tasks file it here, if it applies to tasks and events file it in the view component).


For issues with the Calendar Project web pages (HTML). (Bugs in the on-line help documentation should be reported at the calendarhelp project.)