Rated 5 out of 5 stars

Thank you so much. I have a newer version of Thunderbird, ver. 52, and some of the instructions were written for earlier versions which didn't match what I could get on my screen. Here's how I got it to work. I DL'ed the add-on, copied it to my Thunderbird Extensions folder. When I opened Thunderbird, I looked under View in the mail menu and selected Message Body As. It gave me the option of selecting All Body Parts. I can now see all my formerly blank messages.

This review is for a previous version of the add-on (1.2).