I think it would be quite neat to have custom columns for

1. the address that would match when performing a search
2. the output / slug / folder name for that address

Unfortunately there is currently no standard api for adding such columns.

Links

• Tracking bug for implementing a custom columns api: https://bugzilla.mozilla.org/show_bug.cgi?id=1615801

• POC implementation (it might be possible to turn this into an experimental api) https://phabricator.services.mozilla.com/D97958 https://github.com/Standard8/thunderbird-conversations/blob/95cace58e1623e8aa89c817d5d8166dae2dc7ad9/addon/uiHandler.js#L19-L43

• Archived MDN page about this (probably way outdated) https://github.com/mdn/archived-content/blob/main/files/en-us/mozilla/thunderbird/thunderbird_extensions/creating_a_custom_column/raw.html

• More active tracking bug for an api: https://bugzilla.mozilla.org/show_bug.cgi?id=1817682