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+[CardBook](https://cardbook.icu/) is an awesome complete and well-tested Thunderbird extension implementing many features missing from the default Thunderbird's address book.
+
+Although, there will be a glitch against Thunderbird v68 if you use **Thunderbird-User.JS**.  
+You'll have to **relax** `network.cookie.cookieBehavior` from `2` to `1`.
+
+For further information, see [this page](https://gitlab.com/CardBook/CardBook/wikis/Migration%20to%20Thunderbird%2068#easy-case).
+
+This has been setup [here](https://gist.github.com/HorlogeSkynet/eda281b2b4ff6bb6674d77d4e823431a#file-user-overrides_thunderbird-js) for instance.
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