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Suggestions:
- Automatic contacts search and merge tool (like in Google contacts).
- Integration with Thunderbird's filters - as for now, it doesn't see CardBook's categories and addressbooks.

Implemented features, many thanks:
- Possibility to merge contacts when search filter is used.

Это отзыв для предыдущей версии этого дополнения (9.8). 

there already is a merge tool (right click on selected contact(s))

for the yandex categories, may you contact me by email : cardbook.thunderbird@gmail.com