oleh lkosson (Pengembang) pada Nov. 20, 2020 · tautan permanen

Currently (TB78) there is no permission-based API to modify message list layout. Only way to do it is by using Experiment API (https://thunderbird-webextensions.readthedocs.io/en/68/how-to/experiments.html), which runs without any restrictions, as it did pre-TB68. Previous version ("Show Address Only" add-on) used to run on same permission level, with full local privileges.

You shouldn't trust software downloaded from Internet or take anyone's (especially author's) word for it. The addon's source code is tiny and available at https://github.com/lkosson/full-address-column.

oleh lkosson (Pengembang) pada Nov. 10, 2020 · tautan permanen

Addons can either use built-in APIs (new in TB68, severly limited functionality, but with fine-grained permissions) or directly interact with Thunderbird (as powerful as pre-TB68 addons, but without any permission control).

Currently there is no API to modify or extend message list view, so only way to achieve this functionality is via direct interaction, which requires full access.

Feel free to grab the addon source from github, review it (it's tiny) and install it from local copy. I'm afraid there is no way for me to prove addon is safe and I can't change required permission level.