The Email Address Crawler add-on still works in TB 60 if you first open Tools/Options/Advanced/General/Config. editor and double-click the preference extensions.strictCompatibility to false, OK to close Options. This will allow the add-on to be re-enabled if already installed, or allow the installation.

Thanks for your reply. I've located the most recent version, but don't know how to install it from outside of TB. I've downloaded the add-on, how do I install it to TB?

Fajita_shorty said

Thanks for your reply. I've located the most recent version, but don't know how to install it from outside of TB. I've downloaded the add-on, how do I install it to TB?

Hello Fajita_shorty,

Maybe this will help :

https://support.mozilla.org/en-US/kb/installing-addon-thunderbird

And also :

https://support.mozilla.org/en-US/kb/thunderbird-add-ons-frequently-asked-questions

I went to the link you provided, downloaded the add-on, and tried to install but got an error message from TB (see attached image).

Did you do as suggested by sfhowes  ?

My bad, I did not do that. Now the add-on is working! Thanks!!

Fajita_shorty said

My bad, I did not do that. Now the add-on is working! Thanks!!

Great news  !

Would you be so kind as to remove the Chosen Solution mark from your post and mark sfhowes' post as such  ?

You can do so by clicking on the "Undo" button to the right of the post and then mark sfhowes' post.

Thank you in advance  !

I flagged this thread and asked a moderator to rectify the Chosen Solution mark, so ignore my previous post.