Hello, Using homebrew package manager, I was very happy to find thunderbird 91.1.2 & install same into a mac pro (5,1; os x 10.13.6). After the fact I discovered there is no compatible add-on, for importing / exporting, for this version of thunderbird. I tried to install, via Tools -> Add-ons and Themes, ImportExportToolsNG, without success. This add-on is for an earlier version of t'bird, so wouldn't install into above-mentioned mac. Two Questions: Q(1) - If I reinstall thunderbird using a file downloaded directly from the thunderbird web site (https://www.thunderbird.net/en-US/), will there be available a compatible add-on for importing / exporting? Q(2) - If 91.1.2 can't accommodate import/exporttools ng, which older version of t'bird can I install which will be compatible with a suitable add-on for importing and/or exporting? thank you, bw