Re Thunderbird 102. Just a heads-up.
Note TB102 is not on general (update) release. Some TB extensions do not yet work on TB102, as I found out to my cost after downloading and installing it over top of TB91.
I had to reinstall TB91, also my profiles relating to TB91, as installation of TB102 changes profiles, which then cannot be used if rolling back to an older version e.g. 91.
Some TB extension devs are working on updates, so I will not be allowing auto or manual update from TB91 until that is done.