What is Thunderbird Lightning extension?

Related questions

1. How do I convert an EML file to Word?
2. Does Google Calendar support Caldav?
3. Can I add iCal to Google Calendar?
4. Can I transfer Outlook emails to Gmail?
5. How do I enable calendar in Thunderbird?
6. Can Gmail read PST files?
7. How do I add Outlook calendar to Google Calendar?
8. Can Thunderbird import EML files?
9. Can I use Thunderbird on iPhone?
10. How do I add addons to Thunderbird?

Tags

1. #icalendar
2. #client
3. #compatible
4. #announced
5. #mozilla
6. #newsgroup
7. #produces
8. #lightning
9. #thunderbird
10. #developed
11. #calendar
12. #scheduling
13. #seamonkey
14. #functionality
15. #december
16. #internet
17. #extension
18. #project
19. #suite
20. #foundation
21. #currently