Rated 5 out of 5 stars

by Firefox user 5e49f0 on May 31, 2019 ·

On my thunderbird 60.7.0 (32 bit) it is working in this manner:
download from here:
https://freeshell.de//~kaosmos/index-en.html#eac

then disable extensions.strictCompatibility as explained here
https://support.mozilla.org/it/questions/1242208
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To install in TB 60, you may have to first open Tools/Options/Advanced/General/Config. editor and double-click the preference extensions.strictCompatibility to false, OK to close Options.
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