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Not compatible with 68.4.1

这个评论是针对附加组件的一个早期版本的(13.3)。 

Account Colors is compatible with Thunderbird 68.4.1.

Try uninstalling Account Colors, restarting Firefox twice, and then reinstalling Account Colors.

If that does not work, your Thunderbird profile may be corrupted. Try creating a new Thunderbird profile.