Rated 5 out of 5 stars

@bob_f1: I had the same problem (macOS) update didn't help, this worked for me: I uninstalled "Allow HTML Temp" and installed it again, now again 5 stars.

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

Rated 5 out of 5 stars

works great for emails, but doesn't work for RSS feeds

This review is for a previous version of the add-on (5.7.3). 

It isn't intended for RSS feeds and the button is disabled "by design" when reading a feed