This is how Thunderbird should look by default! Rated 5 out of 5 stars

Thanks for making it work with TB 17 it's very appreciated!

Just wanted to mention that to get the body of RSS feeds to show in the TB 17 version you have to remove the following line from "messageBody.css":

body[selected="false"] {
display: none;
}

Not sure what else that bit of CSS affects but I haven't noticed any problems so far after removing it.

This review is for a previous version of the add-on (1.0.2.0). 

...hmmm. For me RSS even works without this bit, but will try to integrate this one if there are no side-effects in the next version (I don't want to reset the review queue position right now, as there is currently no public version for TB 17).

Edit: I was using plaintext. Thanks to an user I now know the issue, will integrate this (or another fix if this one has side-effects) in the next version.