Comment 152 for bug 52667

OK just tested reply to list 3.0 and it works here on a clean profile. heres what i did for test.
mv ~/.mozilla-thunderbird ~/.mozilla-thunderbird.old
run thunderbird set up one account, install extension, add it to tbird panel and so far no issues. No need to change header veiw nothing please try this and tell me if it works
Not sure why yours crashed but that is up to the author/maintainer of the script. Please confirm this works for everyone.