Great! More secure than default behavior! Rated 4 out of 5 stars

This extension is great. Very simple interface. Would be nice if there was something available from context menu or via a configurable shortcut/hotkey, rather than a button you need to add to the toolbar. I don't like using my mouse, which is why I mention this, and only give it 4 stars. Still, this should be default behavior in Thunderbird (it is in Outlook, even), as it is much more secure to always view in plain text, and selectively html from trusted sources.

This review is for a previous version of the add-on (3.0.3).