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sɛur Roger V. di April 14, 2019 · aseɣwen yezgan

Very useful tool. :-)
I too modified the "install.rdf" file so that this extension would work with Thunderbird 60 (mine is 60.6.1 at time of writing) and as far as I've tested it, it works fine. Thanks Piroli ! :-)
(Those wishing to try this mod may like to search for "Editing an add-on to change its compatibility" on MozillaZine.org)