Rated 5 out of 5 stars

Hello Adam, I have used this tool you created for as long as I can recall. I was disappointed that T/bird 68 had broken this brilliant add-on, and will have to go back to an older version so I can use "Archive This". Sorry I cannot help (except by testing). Your tool has been so reliable, I thought that my Ctrl key had broken, but a different keyboard didn't fix the problem!

This review is for a previous version of the add-on (1.4.11.11). 

A new version that works with Thunderbird 68 should be available soon. See https://github.com/adamroach/tb-archive-this/blob/master/tb68-update.md for details