I added some information in the introduction section (https://developer.thunderbird.net/add-ons/about-add-ons#mailextensions) and in the experiment section (https://developer.thunderbird.net/add-ons/mailextensions#experiment-apis).
Bug 1752706 Comment 12 Edit History
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I added some information in the introduction section (https://developer.thunderbird.net/add-ons/about-add-ons#mailextensions) and in the experiment section (https://developer.thunderbird.net/add-ons/mailextensions#experiment-apis). Edit: Also here: https://developer.thunderbird.net/add-ons/mailextensions/experiments