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Display contact "custom 1" field in columns

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Is there a way to display the "custom 1" field as a column of the address list?

Is there a way to display the "custom 1" field as a column of the address list?

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Are you using Thunderbird's built-in addressbook or an addressbook through an add-on (e.g. Cardbook)? As far as I know the built-in addressbook does not have a "custom1"-field.