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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

Questa recensione riguarda una versione precedente (7.0) del componente aggiuntivo. 

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