What is lightning extension?

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Tags

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