Rated 5 out of 5 stars

Thanks a lot for this add-on. Exactly what I searched for!

One thing is missing. Additionally to the "Show HTML" button it would be nice if there were also a "Show Simple HTML" button. This is, because in most situation where "plain text" ist not sufficient to read a mail, "Simple HTML" does the trick with no need for "Full HTML"

Again: Thanks for this very useful add-on

This review is for a previous version of the add-on (3.7.4). 

Simple HTML (And other options) can now be set as button function in the addon options dialog