Rated 3 out of 5 stars

This has been working great until Thunderbird updated to 91. Since then, when I click "Show HTML", it changes the view setting to "original HTML", and I have to change that setting or it keeps showing HTML in any other posts or email I open. .... I updated to version 7.0, which did not help. I just updated Thunderbird to 91.3.1, which I thought seemed to have solved the problem. Nope. still toggles to view message body as HTML. Funny that sometimes it seems to work right for a few tries, then not anymore. Win 7 OS

This review is for a previous version of the add-on (7.0). 

Which addon version is used? Maybe the addon was not updated, when Thunderbird was updated. There are some reports about such a problem.