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4.2 DOES work for Thunderbird 5.X Rated 5 out of 5 stars
As Sadi mentioned in previous review, you must change the max version, HOWEVER the APP BUTTON apparently does not work, I cannot find a way to activate it. Hopefully this will be addressed in a future version. Till then you must customize the toolbar and add the compact MENU entry.This review is for a previous version of the add-on (188.8.131.52-signed). This user has 2 previous reviews of this add-on.