Sorry, but the design of the Address Book didn't anticipate it being used in this way. It is an email centred design and is weak in its support for data such as street addresses and phone numbers.

Additionally, there is no support for setting the size or layout of labels. If I were wanting to print on labels, I'd be looking for help from the label manufacturer. I've had good support from Avery for their labels. And a label printing program will have specific requirements for the format and structure of the data it is to print on the labels. Most likely it will want a CSV file and here at least, Thunderbird's address book can help you as it can export Contact data to a CSV file.

I tried this add-on in TB 47 and it seems to work properly:

https://addons.mozilla.org/en-us/thunderbird/addon/addresslabel/

(how to install)